Permissions issue in Hybrid exchange

[neonetman]

Good morning,

 

I have a strange issue with access to a mailbox in our Hybrid setup

 

We have 2 users with O365 mailboxes needing to access a mailbox on the on-premise server (we can't move this mailbox as it has a UM plan attached).

 

One of the users is getting access as normal (as they always have had), whilst the other has lost access. I have added permissions to a couple of test users to try and replicate the issue, yet they work absolutely fine. I'm at a loss what could be the cause of this.

 

* 96tho***** still has access

* 96Fur***** has lost access

 

I have tested with 19d*** and 96d*** and they both work

 

[chaplic]

What sort of permissions ? Full mailbox access through the ECP GUI or outlook-level permissions (applied to particular folders and visible in outlook). The latter might work, but is not supported.