Hi @Anonymous,
Could you please share more details about the error message on your side?
Further, could you please share a bit more about the PowerApps cmdlets you used within your PowerShell window?
I have made a test on my side, and don't have the issue that you mentioned. The screenshot as below:

Please take a try to use the following PowerApps cmdlets to import PowerApps module within your PowerShell window:
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Force
dir . | Unblock-File
Import-Module .\Microsoft.PowerApps.Administration.PowerShell.psm1 -Force
Import-Module .\Microsoft.PowerApps.PowerShell.psm1 -Force
Add-PowerAppsAccount
Please check and see if the following blog would help in your scenario:
https://powerapps.microsoft.com/en-us/blog/gdpr-admin-powershell-cmdlets/
Note: Please go into the unziped PowerShell script file (download here) firstly, then run your Windows PowerShell as Administrator.
Best regards,
Kris