Internal server error related to Collabora


I installed a “snap” version of the latest NextCloud (22 or 23 not sure) under Debian 10
I also created a subdomain called “office” for which the Collabora server install pointed to.
Everything worked as it should.

I forgot about installing to the “office” subdomain which I then deleted and of course the documents would not open. Having forgot the configuration, I changed the Collabora Server settings in NextCloud to the middle section which created the error below.
I cannot get into NextCloud dashboard or any other functions at all.

Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.

As a complete novice, I’m looking for some step by step instructions on how to correct my configuration settings in Linux using Putty. Any and all help is much appreciated.