Test mail works <> Mail notifications don't work

I’m sorry, but both “solutions” (downgrading to v19 or sharing files by public link) are no solutions. Maybe you can use the last mentioned “solution” (sharing files by public link) in rare circumstances… but downgrading to an unsupported version with security issues is no option at all.

For all who might come across this post: right now, it seems to be a man-made bug which was introduced with this Github change: merge file activity settings into a single 'favorite changed' item by icewind1991 · Pull Request #22205 · nextcloud/server · GitHub

Don’t ask me why :expressionless:

Some more links which might help in future (in case someone will post any useful response):

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