Signing in leaves the help center, goes through Atlassian, and comes back. Browsers guard that round trip closely, so most failures come from browser settings and have nothing to do with your account.
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Leave the private window. If the widget says Can't log in from a private window, you are in a private window in Safari. Open the help center in a normal window and try again.
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Allow cookies for the widget. The widget keeps your session in a cookie from an Atlassian address (
atlassian.app), stored separately for this help center. If your browser blocks all cookies, it cannot keep your session. In Safari, update to version 18.4 or later. -
Turn off tracking blockers for this site. Privacy extensions and some company filters block the cookies and site storage that signing in needs.
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Check the account itself. Open the Jira Service Management portal directly and sign in with the same account. If that fails too, the problem lies with your account.