Hi @Test User
Your application object appears to be disabled.
Go to the Azure portal and log in with administrator > Azure AD > Enterprise applications. Search for your app (if it doesn't show up initially, make sure you've selected "All Applications", under "Application Type"). Choose the app, and in the new blade, choose "Properties", on the left.
If "Enabled for users to sign in?" is set to "No", then the app is disabled in that tenant. Setting it to "Yes" will enable it.
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