You must update the throttling policy on Office365 Exchange side for mailboxes that are configured for Send As Group feature.
Exchange PowerShell is used to run all commands for updating the throttling policy.
Procedure
In the Exchange PowerShell, run the New-ThrottlingPolicy <policy name> command to create a new policy.
Run the Set-ThrottlingPolicy <policy name> -RCAMaxConcurrency <limit> -RcaMaxBurst <limit> -RcaRechargeRate <limit> -RcaCutoffBalance <limit> -IsServiceAccount:$true command to set policy parameters based on mailbox usage.
Run the Set-Mailbox <service account> -ThrottlingPolicy <policy name> command to assign the policy to Avaya Oceana® command mailboxes.
<policy name> is the name of the policy to create, <limit> is the value for a particular rate limitation, and <service account> is the mailbox address configured with Send As Group feature.
Note:
For the actual rate limit values, Office365 Exchange administrator must ensure that rate limits are correct and sufficient per mailbox.
