Since upgrading our stand-alone YT instance to 2018.1 we have experienced issues with @mention capabilities. While we can @mention a user and the tag is properly created, the email notification is never sent/received.
I have been a YT admin for over 6 years and this is baffling. All notification settings still look correct, individual notification settings (per user) are also fine, and there are no custom workflows that would possibly hinder the notifications from being sent during an @mention.
Is there a known issue with notifications regarding @mention in 2018.1? Has anyone else in the community experienced this behavior? Any help is greatly appreciated and I am happy to provide more info if necessary.