Change in naming convention of user’s Name parameter

SHUikeyMost CmdLets like Get-ExoMailbox, Get-Mailbox, Get-Recipient return fields named Id and Identity. The value in this fields is the same as the one in the Name field. As it is currently the SamAccountName from the local AD we use this as Key to match and sync account data. E.g. licenses are assigned by groups membership. So there is a exchange online mailbox - but no on premise remote mailbox. Scripts daily get all exchange online recipients and check the exchange on premise status of the account and create the remote mailbox if needed and get some information from HCL Domino Servers to configure the mail account. The unique key on premise AD is the SamAccountName, in HCL Domino a field called LDAPID and in Exchange Online it uses Identity. So is there another field were the SamAccountName is stored and accessible through Exchange Online CmdLets?