Problems with ssl certificates related to juju maas and vault

I have a problem,

i dont get how to get my https cert to all units inside my openstack cluster... and i cant find any good documentation on it.

To use the console in the openstack-horizon dashboard you have to have a secure connection that can only be provided if the dashboard has a valid https cert, the cert is currently used in a production environment and should be valid for a specific domain.
Can i even use this cert or do i have to use a vault cert and have signed to use https or so ?

The certs are never part of the apache2 conf in the openstack-dashboard lxd container, i could put them manually inside the folder...
I cant find any solution for this the only thing i can find is that i just have to provide the key and cert like described down below...

i really dont get it... i searched so much and i am just tired of it, the first try i somehow messed up my vault and had to reinstall my complete enviroment... but yeah any help is appreciated.

I tried providing my certs so:

1.
juju config openstack-dashboard ssl_key="$(base64 key )" ssl_cert="$(base64 cert)" --debug
juju run-action --wait vault/0 reissue-certificates

2.
juju config vault ssl-key="$(base64 key )" ssl-cert="$(base64 cert)" --debug
juju run-action --wait vault/0 reissue-certificates