ADManager Plus - Error while creating mailbox

Hi Team,

At the time of user account creation using AD Manager Plus, I received an error stating " Only legacy mailbox is created, Could not connect to the Exchange Server. Click here to troubleshoot."

The user account has been created successfully however there is no Mailbox created.

Post which, I attempted to create user mailbox using the option " Create/Archive User Mailboxes " but then received an error stating " System.Management.Automation.RemoteException: This task does not support recipients of this type. The specified recipient mcfc.co.uk/City of Manchester Stadium/Comms - New/Users/Reception/CFA Tours is of type UserMailbox. Please make sure that this recipient matches the required recipient type for this task. ".

Could you advise what this means and if a possible fix is available?

Kind Regards,
Anup