One of our users is unable to delete mail from the Deleted items on their 365 mailbox.
In Outlook 2016 it appears to delete the mail, but if you click on to another folder and then back in to deleted it is there again. I have tried this in safe mode, disabled all add ins, .old the OST file and let the profile rebuild, a new email profile on a different machine, and also it will not delete from the OWA. When deleting in the OWA you get the message to say this will be permanently deleted, are you sure? When you click yes the selected mail just stays in deleted.
My guess is it is an issue in the background of the mailbox as we cannot remove from the OWA but I thought I would see if anyone had this before whilst we wait for our host to come back.