Re: Check Room is Busy or Available
Hi @Fouad ,
Could you please share a bit more about your scenario?
Do you want to list available Calendar Rooms of your Outlook in your PowerApps app?
If you want to list available Calendar Rooms of your Outlook in your PowerApps app, I think the Office365Outlook.GetRoomsV2() function could achieve your needs.
I have made a test on my side, please consider take a try with the following workaround:

Add a Dropdown control in your app, set the Items property to following:
Office365Outlook.GetRoomsV2().value
set the Value property to name.
In addition, I think the "Book A Room" or "Book a Room (new)" template app in PowerApps could help in your scenario:

Within the OnVisible property of the RoomSelectScreen, you will find the formula to look up for available rooms in your Outlook:

Please consider take a try with above template app, then check if it could help in your scenario.
Best regards,