Fresh install - phpmyadmin - page not found

I’m never connecting using the IP.
So my problem is not with using the IP but the FQDN

I was not aware of this SSO feature, that’s great
I’ve just configured it

But still the button launches on myhestia.domain.com/phpmyadmin (where myhestia.domain.com is the FQDN of the server itself) and results on a 404 error

The only way to get rid of the 404 error is to click on the Web button on top and add “myhestia.domain.com” as if I was going to host a website under that FQDN.
Then I don’t get anymore the 404 error.