can you double check that the global permissions (especially the browse user permission) is correct (https://confluence.atlassian.com/jirakb/jira-user-cannot-add-watchers-to-an-issue-390496933.html) as well as that the project permission is right (Manage watchers right, https://confluence.atlassian.com/adminjiraserver/managing-project-permissions-938847145.html)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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