Microsoft has now confirmed that this issue is resolved.
Thanks
UoD-IT
Latest update from Microsoft -
Current status: The deployment of the fix has completed in the majority of the environments, and we've confirmed with some reporting users that the impact is remediated. We're continuing to monitor the progression of the fix as it finishes deploying to ensure the issue is resolved for all remaining environments.
We've had reports that Users are repeatedly prompted to download "TokenFactoryIframe" when browsing Outlook on the web via Safari on Mac OS.
Microsoft is aware of this global issue and is working on a resolution, we will update this post with progress.
Some users report using google chrome to access outlook online resolves the issue or we would recommend the outlook client.
Apologies for any inconvenience caused
UoD-IT
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