Hi all,
We are running a PowerApps pilot within our organizatioin. One of the things we are trying is to set up is guest users within tenant, so that external users are able to reach our Canvas PowerApps.
We have performed the steps in the documentation: https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/share-app#share-with-guests
Video: https://powerusers.microsoft.com/t5/Videos/Share-PowerApps-With-Guest-External-Users/td-p/348400?utm_medium=referral&utm_source=t.co
The steps in Azure AD are completed, i.e. the guest user has been added and provided with a license.
Next an empty Canvas PowerApp has been shared with the guest user:

The user correclty receives an invitation through mail. However, after opening the app from the email and logging in with the guest user account, the following message is displayed to the guest user:

At this point we do not know where look for resovling this issue. I have read that sometimes this may occur due to resources not being shared, however I believe there are no resources that need to be shared since it is a blank app.
Would anyone have idea or be able to help?
Details that might help:
- Non-guest users are able to open the app properly
- Session ID: 236f8a4a-2792-4d2f-bf23-b1e6c78046a8
- Browser console error: Failed to load resource: the server responded with a status of 403 (): {"error":{"code":"InvalidProviderHostName","message":"The host name 'api.powerapps.com' is not allowed for provider '<null>'"}}