We cannot tag users when they don't have an active Jira session, when the user is not actively logged in, the user shows inactive when we try to tag them. However, once the user logs into Jira and has an active session, we are then able to tag them.
Previously, we could tag a user regardless of them being logged into Jira or not.
This is not how Jira works. It has a list of valid users, and does not care whether they are logged in or not - if someone has an account, they can be "@ mentioned"
This suggests you have some customisation that is looking at logins and blocking the mentions. Could you have a look at
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