Hi Blue_Craig,
Based on my research, it seems this is supported. You could refer to this blog to find more details about
How to migrate Resource (room) mailboxes to Office 365.
In addition, based on my research, using a Room Mailbox by itself for just calendaring in Office 365 does not require any licenses be assigned, but when that same room mailbox is also configured .as a Skype for Business Meeting Room then a license must be assigned.
You could check the license of those account in your environment. Details about this you could refer to
Skype for Business Online Meeting Room Accounts.
Note: This response contains a reference to a third party World Wide Web site. Microsoft can make no representation concerning the content of these sites. Microsoft is providing this information only as a convenience to you: this is to inform you that Microsoft
has not tested any software or information found on these sites and therefore cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found
on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software on the Internet.
Best Regards,
Evan Jiang
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