Hello, @kennisdj051 .
1. A external users will always require a license. However, very soon we'll be enabling a feature that recognizes the license in a user's home and guest tenant so a license doesn't need to be assigned in the guest tenant.
2. Billing occurs on the number of licenses purchased and not who they're assigned to. There are multiple scenarios where who a license is assigned to may change, which is why https://admin.microsoft.com and https://portal.azure.com can be used to change license assignment.
3. Yes, licenses are purchased for an organization and then assigned to users within an organization. Billing occurs for licenses purchased for the organization. Since your application is only a one time use, I'm wondering if PowerApps Portal might be a better solution to your scenario. Feel free to send me a private message if you want to discuss your scenario in more detail.
Hello, @Sachinbansal .
This week. There is one outstanding update to make.powerapps.com happening in the government cloud this week which will allow sharing canvas apps with guests.
@seadude - This scenario isn't supported, guest access in AAD is a prerequisite for canvas app guest access.
If security folks want control over who can invite guests and what guests can access when they're part of the tenant then AAD external collaboration and AAD conditional access may provide the management capabilities desired by security folks.
As for sharing an app with users that change frequently, the app can be shared with an AAD security group and then new users can be added to the group (instead of having to reshare the app with every new user).
I've encountered an issue when trying to share an app with a guest that isn't a google account (see Guest Access with Canvas App for the full story). In both cases, I've added the external user, added a PowerApps Plan 2 Trial license and shared the app with that user. The gmail account is able to run the app, but the Mailfence and Protonmail accounts return a "The app didn't start correctly.Try Refreshing your browser."
I've used different browsers (Firefox, Chrome) and I get the same error.
Session ID: 94b3641b-8fb7-4641-940b-bce6192df943
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