"403 - Forbidden: Access is denied" when using MS Edge for macOS to launch 365 Admin Centre...

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Environment:

macOS Monterey 12.1

MacBook Pro (15-inch, 2017) 2.9 GHz Quad-Core Intel Core i7

16 GB 2133 MHz LPDDR3

Microsoft Edge Version 96.0.1054.34 (Official build) (x86_64)

 

Problem:

Whenever I try to get into the MS 365 Admin Centre, for any tenant I am an admin for; after clicking on the "Admin" icon, I get redirected to what is clearly an IIS type error page, stating:

 

"403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied."

 

When I log into the same tenancies, using Chrome or Safari, on the same system, I have no problem.

When I log into the same tenancies, using Chrome, FireFox or Edge on Windows, I have no problem.

 

Other troubleshooting steps:

Yes, I have turned it off and on, again.

Cleared entire Edge cache.

Run Edge InPrivate - No change.

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