Create and configure resource accounts for rooms and shared Teams devices

 https://learn.microsoft.com/en-us/microsoftteams/rooms/with-office-365?tabs=m365-admin-center%2Cazure-active-directory2-password

https://learn.microsoft.com/en-us/microsoftteams/rooms/with-office-365?tabs=m365-admin-center%2Cazure-active-directory2-password

Microsoft 365 resource accounts are mailbox and Teams accounts that are dedicated to specific resources, such as a room or projector. These resource accounts can automatically respond to meeting invites using rules you define when they're created. For example, if you have a common resource such as a conference room, you can set up a resource account for that conference room that will automatically accept or decline meeting invites depending on its calendar availability.

Every resource account is unique to a single Microsoft Teams Rooms installation or Teams display hot-desking implementation.

Important

Microsoft 365 resource accounts aren't the same as Teams resource accounts. Teams resource accounts can be used with call queues and auto attendants to accept phone calls from external phone numbers. Microsoft 365 resource accounts are tied to an Exchange Online mailbox and enable booking of shared resources, such as rooms, projectors, and so on.