Greetings! It's a pleasure to have you here at the Community forum. We appreciate you letting us know your concern.
Sometimes a browser-related issue causes QuickBooks to behave strangely. We can typically fix the problem via typical browser troubleshooting. Let's first sign in to your QBO in a private window. Here are the keyboard shortcuts:
Safari: Command + Shift + N
Google Chrome: CTRL + Shift + N
Mozilla Firefox or Microsoft Edge: CTRL + Shift + P
Once you're in, reopen your account and change your email address again. If it's resolved, return to your regular browser and clear the cache to start afresh. If the same problem occurs, we can try another supported browser. The one you're using right now may have a short-term issue with QuickBooks Online.
Don't hesitate to get in touch with us if you have any more queries or problems relating to QuickBooks. I'm prepared to assist you, and we always have your back. Be careful!
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