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)
For JSM June Challenge #2, share how your non-technical teams like HR, legal, marketing, finance, and beyond started using Jira Service Management! Tell us: Did they ask to start using it or...
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