PowerApp Authentication with Azure AD Token

[mgoobjk]

Hi Community, 

Is there any possibility to pass an Access_Token from Azure AD for authentication to a PowerApp (Canvas App)?

Use Case:

My Power App runs in an mobile flutter application, where the user is already authenticated and has a valid token from Azure AD. The Power App runs in a web view (iFrame) and I don´t want the user to sign in again to the power app.

And is there something like an app registration in azure ad for a power app? I  saw it has an application id, but I could´t find it in our Azure AD...

Thanks in advance!