Recently while I was working with my Power Apps in Edge browser, faced this issue with no clue on first sight and see community reaching out to Power Apps forum. So thought of sharing simple work around.
I was using https://make.powerapps.com, while I clicked on Signout of my current logged in account in the maker portal. Next time when trying to login, it kept on prompting the message saying you need to signup. It takes me no where to re-enter my credentials, opening https://make.powerapps.com/ in other tab doesn’t help even.
It didn’t gave me any clue about what this error was exactly seeing the URL https://make.powerapps.com/error/nobaptenant of this page.
As per Microsoft article referenced below, I have simply tried to clear my browser cookies and cache and soon able to open the maker portal without any issue.
References:Troubleshooting startup or sign-in issues for Power Apps
Hope this helps someone facing similar issue…