Hi Everyone,
Today, I was trying to logic to Make.PowerApps.com and I was getting a popup as below. The reason could be, if you have logged on with two or more user accounts to different Dynamics 365 system, you might get this issue.

Clearing browser cache helped me to get rid of the issue.
Hope this helps.
—
Happy 365’ing
Gopinath
One thought on “Sign in required popup – Make.PowerApps.com”