Dear customer,
It seems that the official link is no longer valid.
I totally understand your concern. and we're very sorry for any inconvenience that may caused.
we will also report this issue and hopefully receive an answer as soon as possible.
If your case is quite urgent, we recommend you open a case in Microsoft CSS support.
Support options for business users
https://support.microsoft.com/en-us/gp/support-options-for-business?wa=wsignin1.0
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