Your Inbox rule that has an action forward messages doesn't work in Office 365.
This behavior is by design when the rule is forwarding messages to 10 or more individual recipients. This is a result of the "forwardee" limit in Office 365, which is described at Exchange Online Limits.
Article ID: 4021948 - Last Review: 19 ພ.ພ. 2017 - Revision: 11