Hi Leslie,
Welcome to Atlassian community! A community where regular Atlassian users help each other.
Since you have written very few information about your problem, I am afraid that no one will be able to help you.
What exactly is your problem - "Assignee to me" doesn't work in Jira mobile?
Can't login and getting a 403 error?
Are you connecting to Jira Cloud or your own Jira Server/ Data Center solution?
Pavel
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