@scooke : thank you
Yes, I have another app on the domain.
I pressed 'save' to re-save and re-start it.
The domain.tld/.well-known/matrix/server returns a response.
But the tester link you gave returns an error
Connection Errors Get "https://107.155.122.83:8448/_matrix/key/v2/server": context deadline exceeded (Client.Timeout exceeded while awaiting headers)And complains there is no SRV record.
Seems to me that the tester is not compatible with Cloudron matrix installs which are on :443
Maybe it's a DNS propagation issue as it's been changed ... but has it really? because Cloudron installs are under a wildcard in my case.
I will try again in a while in case it is a propagation issue.
But there is one change.
Previously Element said "cannot find" your server incroyable.net, and now it says "you are not allowed to view this server's rooms list" and I could successfully join your room with a direct link.
And I can find some other random servers also.
Think I can this is now working, despite tester link errors.
Many thanks for your help !