Environment: Two Dc+exchange 2013 (front and back in all)
Fault:
New user mailbox appears in ECP
Using the EMS input command prompt error
Workaround:
1.EMS input command prompt error, with PowerShell input from administrator on the server
Add-pssnapin *exchange*-erroractionsilentlycontinue
Then remember to restart the server.
2. New user mailbox load balancing could not find a valid mailbox database, in the shell input:
get-mailboxdatabase| FT name,isexcludedfromprovisioning
Display the database isexcludedfromprovisioning to be True , and then continue typing
Get-mailboxdatabase | Set-mailboxdatabase-isexcludedfromprovisioning $false
You can create a new user mailbox.
About the meaning of isexcludedfromprovisioning
The isexcludedfromprovisioning parameter Hashave and the valid values, $True and $False. When you set the "to $True, the mailbox database was excluded from the automatic distribution process. Whenyou set it to $False, the mailbox database was included in the automaticdistribution process. The default value is $False.
Reference link: https://technet.microsoft.com/en-us/library/ff477621 (v=exchg.150)
This article from "Gs_hao" blog, declined reprint!
[Case sharing] Exchange 2013 new mailbox load balancing fails to find a valid mailbox database error