Hi @neo64 ,
Could you please share a bit more about the issue? Is there some prompt/warning message when you sign in PowerApps?
Do you mean that you could not sign in PowerApps with your Community Plan?
Currently, I could not reproduce your issue on my side. Please consider clear cache of your browser, then try it again, check if the issue is solved.
If your sign in account owns a Office 365 license include PowerApps, please consider enable this license within your Office 365 Admin Center, then try it again, check if the issue still exists.
In addition, you could also consider sign up PowerApps Plan 2 free trial for your sign in account, then try it again, check if the issue is solved.
More details about signing up for PowerApps Plan 2 free trial, please check the following article:
https://docs.microsoft.com/en-us/power-platform/admin/pricing-billing-skus#powerapps-plan-2-free-trial
If the issue still exists, please consider submit an assisted support ticket through the following link:
https://powerapps.microsoft.com/en-us/support/pro
Best regards,
