Delegate Mailbox not syncing (Outlook 2016 for Mac)

[rickjames]

Morning all,

 

I have a user who's experiencing issues with a mailbox he has Send As/Full Access on his Macbook; essentially no mails are syncing automatically and if he has to click Send & Receive in order for them to pull them down. We've done the following

 

- Removed mailbox and added it again

- Emptied Folder Cache

- Remove delegation and reapplied.

 

Any other tips or suggestions? We run a O365 environment and his own mailbox appears to be fine.