Problem
When attempting to log time on behalf of certain users, the process fails with a generic "Something went wrong" pop-up. All users hit this when logging time for the same specific individuals.
Solution
This can be caused by a known issue with Atlassian (ECO-1507). On Forge-migrated sites, Jira fails a permission check for any user who has never logged in to Jira and, therefore, hasn't been verified. Since Tempo's worklog creation relies on that same permission check, logging time for one of these users fails.
To confirm this is the cause, check whether the affected users have ever logged into Jira themselves.
Unfortunately, this is not something Tempo can fix. Until Atlassian resolves it, the workaround is for each affected user to log in to Jira at least once and enter their own time, rather than having someone else log it for them.