I've gone through several guides and spent several hours, but I can not seem to get Azure AD authentication working in my simple app. I am trying to turn on "Application is multi-tenant" in my Azure Active Directory, and I get the following error:
The App ID URI is not available. The App ID URI must be from a verified domain within your organization's directory.
How can I change my Application to have the same domain as my Azure AD? (*.onmicrosoft.com).
Am I doing something wrong here?
The message is pretty descriptive.
First you have to take a verified domain which is linked to your Azure AD. You can take it from the Domains tab on your Active Directory management page:
Then your AppID URI must be within any of those:
Only then you will be able to make your app Multi Tenant.
来源：https://stackoverflow.com/questions/31434176/cannot-turn-on-multi-tenant-for-azure-ad-authentication