This article discusses the resolution of the AADSTS500014 error, which occurs when the service principal for the resource https://dev.teams.microsoft.com is disabled. The author shares their experience with encountering this error while working with the Developer Portal and App Studio in Teams. They provide step-by-step instructions on how to resolve the issue by navigating to Azure Active Directory, selecting Enterprise applications, unselecting the Application type filter, searching for App Studio, and enabling the "Enabled for users to sign-in" option. The author notes that this resolution may affect all users in the tenant. After making these changes, the Teams and App Studio in the Developer Portal should start working properly.
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