We have an Outlook resource - Van1 - that when a user tries to book it, receives the message that "Van1 has eclined your meeting becasue it is recurring." This happens by default even though the user does not even want a recurring meeting.
However, the "Decline recurring meetings" is not checked for Van1. People have booked recurring meetings for this is the past. Also if you do not select Van1 as a resource, but rather as a regular attendee, the meeting is accepted.
This resource has worked fine in the past, so this is a new development.