Inbox rule to forward messages doesn't work in Microsoft 365
Original KB number: 4021948
Symptoms
Your Inbox rule that has an action forward messages doesn't work in Microsoft 365.
Cause
This behavior is by design when the rule is forwarding messages to 10 or more individual recipients. This is a result of the forwarded limit in Microsoft 365, which is described at Exchange Online Limits.
Workaround
To work around this behavior, create a distribution group or a Microsoft 365 group, and then add the individual recipients to the group. For details, see Create a group in the Microsoft 365 admin center.
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