Unable to activate scanning ENVY_6400 series

I had previously been unable to even use the print function but I did get that sorted.
Printer ENVY_6439e Pro using Ubuntu 22.10 installed last week
However I have noticed a comment when trying to scan that it cannot open
/etc/cups/ppd/ENVY_6400.
Looking at the ppd diretory there are two files there ENVY_6400.ppd and ENVY_6400.ppd.0
Thinking it might be a permissions problem I chmod 4777 ENVY_6400.ppd
but to no avail.
The program reports that a plugin is required, either download or existing copy.
I have in my download folder hplip-3.22.10 which I used to install the printer.
It scans OK on Windows but reports that there is no driver for this printer.
The printer is ENVY_6430e Pro which does not exist in the enormous list of printers.
ENVY_6400 series is in the list so I presume the interface is the same for all 6400 series.
Running hp_check -t reports all OK, but the scanner does not work.
barry@barry-vk2aab:~$ hp-check -t
/usr/bin/hp-check:685: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if 'getfacl' not in g and '' is not g and 'file' not in g:
Saving output in log file: /home/barry/hp-check.log

HP Linux Imaging and Printing System (ver. 3.22.10)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the
HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies
are installed to successfully compile HPLIP.
2. Run-time check mode (-r or --run): Use this mode to determine if a distro
supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball
has the proper dependencies installed to successfully run.
3. Both compile- and run-time check mode (-b or --both) (Default): This mode
will check both of the above cases (both compile- and run-time dependencies).

Check types:
a. EXTERNALDEP - External Dependencies
b. GENERALDEP - General Dependencies (required both at compile and run time)
c. COMPILEDEP - Compile time Dependencies
d. [All are run-time checks]
PYEXT SCANCONF QUEUES PERMISSION

Status Types:
    OK
    MISSING - Missing Dependency or Permission or Plug-in
    INCOMPAT - Incompatible dependency-version or Plugin-version

---------------
| SYSTEM INFO |
---------------

 Kernel: 5.15.0-58-generic #64-Ubuntu SMP Thu Jan 5 11:43:13 UTC 2023 GNU/Linux
 Host: barry-vk2aab
 Proc: 5.15.0-58-generic #64-Ubuntu SMP Thu Jan 5 11:43:13 UTC 2023 GNU/Linux
 Distribution: 12 22.04
 Bitness: 64 bit

-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.22.10
HPLIP-Home: /usr/share/hplip
HPLIP-Installation: Auto installation is supported for ubuntu distro 22.04 version

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.

[hplip]
version=3.22.10

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-3.22.10
html=/usr/share/doc/hplip-3.22.10
icon=/usr/share/applications
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv/hp
bin=/usr/bin
apparmor=/etc/apparmor.d
# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=no
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=no
foomatic-drv-install=no
foomatic-ppd-install=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.22.10
restricted-build=no
ui-toolkit=qt5
qt3=no
qt4=no
qt5=yes
policy-kit=no
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=yes
class-driver=no

Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: No such file or directory

Current contents of '~/.hplip/hplip.conf' file:
[commands]
scan = /usr/bin/xsane -V %SANE_URI%

[fax]
email_address =
voice_phone =

[installation]
date_time = 01/22/23 16:45:21
version = 3.22.10

[last_used]
device_uri =
printer_name =
working_dir =

[polling]
device_list =
enable = false
interval = 5

[refresh]
enable = false
rate = 30
type = 1

[settings]
systray_messages = 0
systray_visible = 0

[upgrade]
last_upgraded_time = 1673579803
notify_upgrade = false
pending_upgrade_time = 0

 <Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>

-------------------------
| External Dependencies |
-------------------------

 cups CUPS - Common Unix Printing System REQUIRED 1.1 2.4.1 OK 'CUPS Scheduler is running'
 gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.55.0 OK -
 xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 0.999 OK -
 scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.1.1 OK -
 dbus DBus - Message bus system REQUIRED - 1.12.20 OK -
 policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -
 network network -wget OPTIONAL - 1.21.2 OK -
 avahi-utils avahi-utils OPTIONAL - 0.8 OK -

------------------------
| General Dependencies |
------------------------

 libjpeg libjpeg - JPEG library REQUIRED - - OK -
 cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - 2.4.1 OK -
 cups-image CUPS image - CUPS image development files REQUIRED - 2.4.1 OK -
 libpthread libpthread - POSIX threads library REQUIRED - b'2.35' OK -
 libusb libusb - USB library REQUIRED - 1.0 OK -
 sane SANE - Scanning library REQUIRED - - OK -
 sane-devel SANE - Scanning library development files REQUIRED - - OK -
 libavahi-dev libavahi-dev REQUIRED - - OK -
 libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.9.1 OK -
 libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 3.0.2 OK -
 python3X Python 2.2 or greater - Python programming language REQUIRED 2.2 3.10.6 OK -
 python3-notify2 Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - OK -
 python3-pyqt5-dbus PyQt 5 DBus - DBus Support for PyQt5 OPTIONAL 5.0 5.15.6 OK -
 python3-pyqt5 PyQt 5- Qt interface for Python (for Qt version 4.x) REQUIRED 5.0 5.15.6 OK -
 python3-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.18 OK -
 python3-xml Python XML libraries REQUIRED - 2.4.7 OK -
 python3-devel Python devel - Python development files REQUIRED 2.2 3.10.6 OK -
 python3-pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 9.0.1 OK -
 python3-reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.6.8 OK -

--------------
| COMPILEDEP |
--------------

 libtool libtool - Library building support services REQUIRED - 2.4.6 OK -
 gcc gcc - GNU Project C and C++ Compiler REQUIRED - 11.3.0 OK -
 make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.3 OK -

---------------------
| Python Extentions |
---------------------

 cupsext CUPS-Extension REQUIRED - 3.22.10 OK -
 hpmudext IO-Extension REQUIRED - 3.22.10 OK -

----------------------
| Scan Configuration |
----------------------

 hpaio HPLIP-SANE-Backend REQUIRED - 3.22.10 OK 'hpaio found in /etc/sane.d/dll.conf'
 scanext Scan-SANE-Extension REQUIRED - 3.22.10 OK -
ENVY_6430e Pro Printer

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

device `hpaio:/usb/ENVY_6400_series?serial=TH293GJ0KS' is a Hewlett-Packard ENVY_6400_series all-in-one

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

  Device URI Model
  -------------------------------- -------------------
  hp:/usb/ENVY_6400_series?serial= HP ENVY 6400 series
  TH293GJ0KS

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

ENVY_6400
---------
Type: Printer
Device URI: hp:/usb/ENVY_6400_series?serial=TH293GJ0KS
PPD: /etc/cups/ppd/ENVY_6400.ppd
PPD Description: HP Deskjet Plus 6400 Series, hpcups 3.22.10
Printer status: printer ENVY_6400 is idle. enabled since Wed 18 Jan 2023 12:15:08
Communication status: Good

--------------
| PERMISSION |
--------------

USB ENVY_6400 Required - - OK Node:'/dev/bus/usb/001/003' Perm:' root lp rw- rw- rw- rw- rw- r--'
No errors or warnings.

Done.
barry@barry-vk2aab:~$ dir /etc/ppd/
dir: cannot access '/etc/ppd/': No such file or directory
barry@barry-vk2aab:~$ dir /etc/cups/ppd
ENVY_6400.ppd ENVY_6400.ppd.O
barry@barry-vk2aab:~$