I have conference room mailboxes that used to auto accept when booking a room but when I moved those to a new databse they stopped auto accepting. I moved them back to the original database and it still doesnt auto accept. The resource booking attendant is enabled and when I run get-calendarprocessing the result is - automate process is autoaccept.
I've also used the mailbox and databse repair request and it hasnt solved the problem either.
New-MailboxRepairRequest -Mailbox "mailboxname" -CorruptionType SearchFolder, AggregateCounts, ProvisionedFolder, FolderView