Hi @Wassini ,
Do you want to share your app with everyone in your Org?
Further, do you want everyone in your Org to access your app within the MS Teams?
Firstly, if you want everyone in your Org to access your app within the MS Teams, you must share your app with your Org or individual users in your Org with proper permission.
More details about sharing an app, please check the following article:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/share-app
If you want everyone in your Org to access your app within the MS Teams, you need to embed your app into a MS Teams tab. Please check the following article for more details:
https://docs.microsoft.com/en-us/powerapps/user/open-app-embedded-in-teams
In addition, if you want to share your app with external users outside your Org, I afraid that there is no direct way to achieve your needs. As an alternative soluton, you could consider add these external users as Guest in your Azure Active Directory tenant, then you could share your app with the Guest account for the external users.
Please check the following article for more details:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/share-app#share-with-guests
Best regards,
