Dear SS
Good day! Thank you for posting to the Microsoft Community. We are happy to help you!
First of all, we regret for the inconvenience and inconvenience caused to your work. Based on your description, to help you better please kindly give me more details(such as a complete screenshot which includes error information and error code) so that I can do more research and tests, thanks.
By the way if you don't get error, then please kindly try to share a full screenshot which includes the page of "it keeps sending login prompt."
Thank you in advance for your understanding! Your patience and cooperation will be greatly appreciated. I hope all the best!
Sincerely
Kerry Chen | Community Moderator