Getting the following error when I try to add a user to Send As group

Problem with the Mailbox - reported the issue to Microsoft error The ACL for object "CN=Customer Response,OU=dairygoldcloud.onmicrosoft.com,OU=Microsoft Exchange Hosted Organizations,DC=EURPR07A006,DC=PROD,DC=OUTLOOK,DC=COM" is not in canonical order (Deny/Allow/Inherited) and will be ignored.

Suspect its an issue with an unrecognised SID

We had the issue again last week and had to delete and recreate the mailbox.