Hi Richard2038,
As the error message showing maybe administrator has disabled the application, so I suggest you contact your Tenant admin to confirm If Outlook was blocked. Here is the reference:
https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/disable-user-sign-in-portal
In addition, the error message indicate maybe the subscription within the tenant has lapsed. if it is convenient, please share your email account via Private Message to let me check the situation of your tenant.
Your cooperation and understanding are truly appreciated.
Thanks,
Linda