This article will show you how to book meeting rooms through the default Outlook desktop application, and the Teams Places application.
Check availability
In Outlook, add a Calendar.
Add from Directory
Select PEN-Room-PEA01E
In the Calendar view, you can see who else is using (parts of) this room, and when it’s in use ... more importantly, when it’s available.

In Outlook, select Calendar view
Select New Event => Event

Enter a Name for the event
‘Invite’ the room as an attendee … PEN-Room-PEA01E
Enter the time

The room will default to the same location.
The room is Teams-capable, and can be a Teams meeting if desired.

An event reservation will be created

Alternately, in Teams, select the Places (map locator) icon.
Optionally, check in to the building PEN-PE
Select Help me find a room

Places will list the rooms and show their availability, based on default use of ‘Now’ for one hour.
The room can still be Booked. This will again generate a reservation, which can be updated to show the correct date / time if not right now

The reservation will be created with a current date and time.
Select the pencil icon to edit the date and time to reflect the correct desired booking.

Send the reservation
The booking will show on the Calendar for that room
