Issues with auto-processing on an Exchange resource mailbox

[mistersparky]

Good morning everyone!

 

I've got a strange issue with auto-processing on some of our Exchange resource mailboxes. These resource mailboxes have all been configured with relatively standard auto-processing rules, however not all meeting requests appear to be accepted automatically, with no clear pattern as to what is and is not accepted.

 

For a given resource mailbox, if I take a look the deleted items I will see multiple meeting requests which correspond to requests that the resource mailbox has received and fall under the in-policy criteria for the resource, and which were automatically accepted and added to the calendar (with the meeting request itself deleted).

 

However, if I look at the inbox for the same resource mailbox, I see multiple meeting requests that also fall under the in-policy criteria, but which for some reason are not auto-accepted by the resource mailbox.

 

Does anyone have any ideas what could be causing this, or what I could test to try and resolve?

 

Thanks in advance for any help with this!