Maintain control of your Microsoft 365 data
Polina
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Full Name: Polina Vasileva
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Re: Mailbox errors: The HTTP request was forbidden with client authentication scheme 'Anonymous'.

Post by Polina » 1 person likes this post

The official deadline from Microsoft is July 1 2026. Until that time, please follow recommendations provided in KB4796.

Thanks
DaStivi
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Full Name: Stephan Lang
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Re: Mailbox errors: The HTTP request was forbidden with client authentication scheme 'Anonymous'.

Post by DaStivi » 2 people like this post

but this is also no one-time fix! as i've wrote in my posts before... my best guess is right now, when users license changes from kiosk to Ex the ews get's "nulled" and then produce errors in the backup...

the earlier we can get a GraphAPI-EXO Backup version the better!!
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