If you are on Cloud and you're still running into this issue try the JIRA App from the App store and see if you're able to login. If this is server, does this work in another browser,e.g. Chrome, Firefox?
I would also check to make sure the JIRA Mobile module is enabled:
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Hi Community, Jessica here from the Confluence Product Marketing team! July’s community challenge is all about sharing pictures — and as an extension of our first post on what ...
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