Ubuntu Browsers "This application has not been enabled for your directory"

Hi
I've upgraded my PC from Windows 10 to Ubuntu Desktop and, as part of my personal data strategy, removing associations with Google and Microsoft. This includes using alternative browsers, in this case I am using Brave or Firefox but I get the Access Error message with either browser so assume its because I am using Ubuntu and its therefore not browser specific.

Search results returned so-far do not offer the optimal solution for this. The document I found is https://docs.aws.amazon.com/workmail/latest/adminguide/access-rules.html
but no optimal steps jump out as to how to allow Ubuntu and Firefox/Brave and the 2 references it makes to Linux are irrelevant.

Any tips on how to solve this will be most appreciated.

Thanks
Kevin

Edited by: kevinyea on May 26, 2021 11:41 PM