Hi Jose,
Are you using Office 365 account? If so, you can use an admin account to log into Office 365 Portal> Resources> Rooms&equipment> add new meeting room there. Then, when you set up meetings in Outlook client, you can enter the meeting room in the location bar.
If you want to use room list, you need to create lists from PowerShell with the Exchange Online:
- connect to Exchange Online PowerShell;
- create a room list distribution groups for the Test rooms with those two lines :
$RoomAlias = Get-Mailbox -RecipientTypeDetails RoomMailbox -Filter {Office -eq 'Test'} | select -ExpandProperty Alias
New-DistributionGroup -RoomList -Name 'Test' -Members $RoomAlias
3. Once created, you will see the list in the “Room Finder” tab of Outlook;
4. Then, you can use it to make your room booking way more easier for your users.
Regarding the last query, log into Office 365 Portal> Resources> Rooms&equipment> double click the room name> Edit delegates> Add delegates> add your account and save it> you will access meeting mailbox calendar in your Outlook client.
Regards,
Vanessa