Hi Sokoban,
Thank you for posting in Microsoft Q&A forum.
1,Please make sure the user you are using have correct permissions. Similar thread for your reference:
Policies for Office-apps in Intune – setup the permission for access
2,When we see messages like "Our services aren't available right now," it may indicate that there is an issue on Microsoft's side, we can try again later.
Best regards,
Simon
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