The author encountered an error message while trying to open a model-driven app using a specific URL. The error message indicated that the user did not have access to the application. The author, who is a system admin, was surprised by this error because system admins typically have access to all applications. They reached out for support and received advice to try a different URL, which resulted in the expected "user does not have a license" error. The author also noted that the access checker may not accurately reflect the licensing status for system admins. To check licenses, users can go to the "my account" page in Microsoft 365 and view their subscriptions.
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