Hi kayte m,
Thank you for sharing the details of your situation to Microsoft Q&A Forum. I know how frustrating it can be to get stuck in a sign‑in loop across multiple Microsoft apps. Since you’ve already tried common troubleshooting steps and even tried to log feedback in Feedback Hub, the best way forward now is to work directly with Microsoft Support.
You can reach them by visiting support.microsoft.com > Briefly describe your issue > Enter > Scroll down to find "Contact Support". Providing the exact error behavior (for example, “sign‑in popup repeats endlessly”) will help the support team escalate your case more quickly.
Because this issue affects multiple apps, Support can check whether it’s account‑related or a deeper system problem, and they’ll have the tools to reset or repair your sign‑in configuration.
I hope this helps you get the thing sorted out quickly!