Missing conference room from Room Finder list

When scheduling a meeting, if using the Scheduling Assistant and Room Finder, selecting Conference Rooms results in a list of all conference rooms but except 1 conf. room .(conf-a room)

If using the Rooms button on the Appointment the Select Room ( conf-a-room) dialog is displayed and it is on there:

not sure why in (conf-a room ) in room finder is not displayed, i checked it is not hidden in address book.

we have on premise AD and is replicated through AAD sync to office 365

any attribute I should check on onpremise AD
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Shreedhar EtteTechnical ManagerCommented:
Make sure conf-a-room is member of the same groups as other rooms.

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