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[Amol Dorkhande]

Some users are facing issues with joining Jira. Can someone please help to resolve this issue?

[Aaron Brady]

Welcome to Atlassian, Amol!

It looks like your users are experiencing a product access issue. I would recommend reviewing this support article: 

How does product access work? | Atlassian Support 

Essentially, groups are provided product access within Atlassian. If the users are not members of the groups with access, then they will also not have access. 

Hope this helps!

-Aaron