Can't subscribe to WF via Mastodon and Friendica

Help
,
1

Hello,

I’m hosting WF via Yunohost just for myself, no other users involved. I can access the blog via URL, but when I try to find and subscribe via Mastodon, I get an

422Mastodon::HostValidationError on https://writefreely.irgendwo.social/.well-known/webfinger?resource=acct:zeitverschreib@writefreely.irgendwo.social

I tried regenerating the keys, no change.

Is this is know problem?

Thanks in advance.