As indicated by the following table, in a hybrid deployment you can move an LRS account from on-premises to online with the following caveats.
Topology |
Lync |
Exchange |
Phone/Mediation Server |
Notes |
Hybrid (Split Domain) |
|
|
|
|
On-premises |
Online |
On-premises |
Supported |
|
Online |
Online |
N/A |
Supported |
The LRS accounts are synchronized with DirSync from the on-premises directory to the online directory in Office 365 Windows Azure Active Directory. Therefore, to move an LRS account, you simply disable the account in the on-premises Lync pool and enable it in the Lync Online pool. Note that the Move-CsMeetingRoom cmdlet does not work for moving an on-premises account to an online pool.
The Exchange resource mailbox account being moved from on-premises to online should already be enabled in the on-premises Active Directory.
PS C:\Windows\system32> Disable-CsMeetingRoom –Identity confrm1