I reconfigured nginx a couple of minutes ago to default to turn and now it works for me.
meet.blahblah.com web_backend; turn.blahblah.com turn_backend; default turn_backend;
Without defaulting, I do not receive the certificate. No clue why…
Edit: Sorry, it’s late, told it vice versa… had to default to turn and not to web to make it work (changed it above in the thread). When defaulting to web I receive the meet.blahblah.com certificate altough requesting turn.blahblah.com