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:
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs