My Azure Lab worked fine for months. But I have had some new users register and be granted access, and when they log into their training lab to start their VM they see a a red error - There was an error fetching tenants. Please reload the portal to try again. If you wish to switch tenants, you can sign in directly into a tenant by specifying the tenant domain or tenant id as part of the portal URL. For example, https://portal.azure.com/tenantdomain.com or https://portal.azure.com/tenantID I see the same error appear "in the background" in my Azure Portal. I am not trying to switch tenants or anything, and I don't know why the Lab users would see this. Eventually, their machine started, and when they shut it down it did that too, but the error popped up again. Doesn't look good.