Quick update here, the AAD issue is now resolved. You should be able to use portal even using their original way now. We have seen similar issues in the forum, we will post the same so everyone who have the same issue can find reference, please not be surprised.
Similar issues:
https://video2.skills-academy.com/en-us/answers/questions/742929/customvisionai-whoops-we-can39t-seem-to-find-the-p.html?childToView=744351#comment-744351
https://video2.skills-academy.com/en-us/answers/questions/742944/index.html
https://video2.skills-academy.com/en-us/answers/questions/742999/index.html
https://video2.skills-academy.com/en-us/answers/questions/744686/cannot-access-httpswwwcustomvisionai.html
Please let me know if you still have any issue, sorry for the inconvenience again and thank you for your patience.
Regards,
Yutong