This is a Microsoft Tenant used for Managed Resources
From https://www.jlaundry.nz/2024/overview_of_azure_managed_vnets/:
- When you try to click on a Private Endpoint in the Azure Portal, and you get a 401 No access error with the message "The access token is from the wrong issuer 'https://sts.windows.net/.../'. It must match the tenant 'https://sts.windows.net/33e01921-4d64-4f8c-a055-5bdaffd5e33d/' associated with this subscription.", this is a Managed Private Endpoint.
33e01921-4d64-4f8c-a055-5bdaffd5e33d
is the Tenant ID associated with Azure managed infrastructure (MSAzureCloud.onmicrosoft.com
).