Microsoft Places desk declined despite check-in

Each We've just started using Places in our office and a few users have reported recieving a desk decline email due to no check-in on the desk, despite them using the check-in button on the Places app to check-in on arrival to the office. Has anyone seen this previously?

Each desk has two monitors, which I have associated with the desks in the Teams Pro Management portal to enable detection and check-in. Reservation settings for all desks are as below.