Guest access to personal apps/tabs

ArneDD - Hello,
After trying few scenario with the Guest user, I didn't find any way for admin to pin an app for Guest user. I have also tried assigning access policy via Teams admin center to Guest but it didn't worked. So, we can say as of now we cannot add or pin apps for guest users.

Before answering your other questions, first you need to make sure that you have switched the organization from guest user account. Guest user cannot access app direct link within their tenant.

You will find option to switch organization here:

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Guests can't install, update, or delete apps into a shared context, such as a chat, channel, or meeting, but they can to their personal scope using message extensions and direct links.

---So what does "their personal scope" mean and what kind of direct links? Links to what?

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 - Personal scope means here is 1:1 chat. User can add app if he have direct link of the app.
Now about direct link: The direct link of app is the link that you copy from the Apps store.
Steps to get direct link:
1. Click and open Apps.

2. Navigate or Search for the app you want direct link.

3. Once you found it, click on the ... and select Copy link

You can share this link with guest users and they will be able to install that app in personal scope.

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Guests don't have access to the Teams app store from the Teams desktop application, ...

---If the docs explicitly mentions "don't have access...from the Teams desktop application" then shouldnt it be different in the webapp or on mobile? 
...but they can access it with a direct link.

---and again: What direct link? And what can they actually do with the link?

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Guest user doesn't have access to Teams app store on Teams desktop as well as web client. When guest user access the direct link of the app they will get to see this screen, which allows them to install or open the app.

I will update you if I get to know about any backlog item related to pinning 3P apps.

Thanks, 

Hunaid Hanfee 

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