Hi @Adam Barker ,
Does this issue persist on Teams web client?
In this case, we recommend you go to Teams admin center() to see if the form app status is “allowed” in “Manage apps”.
https://learn.microsoft.com/en-us/microsoftteams/manage-apps#view-apps
Besides, please ensure you have allowed Forms apps in the app permissions policies.
https://learn.microsoft.com/en-us/microsoftteams/teams-app-permission-policies
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