Hi @Cristian Perez
If you want to upload a custom app to Teams, please make sure the app meets the following conditions:
a.Ensure to create your app package and validate it for errors.
b.Enable custom app uploading in Teams.
c.Ensure that your app is running and accessible using HTTPs.
At the same time, you can also search PowerApps directly in Teams and create a Canvas App for your team directly.
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