
Get-Mailbox -ResultSize Unlimited | select PrimarySMTPAddress,GUID | Export-CSV C:\O365userguids.csv -NoTypeInformation If all users fail use the following command to create a CSV file containing all users' GUID.Use the ' Mark' tool and copy the GUID to the clipboard and store in a document for safekeeping.Wait for the connection to establish and use this command to glean mailbox GUID (Edit Primary SMTP Address):.Enter your O365 Admin Credentials to Allow access to MSOnline.$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $LiveCred -Authentication Basic -AllowRedirection Open Windows Powershell and Connect to Office 365 using.Repeat for any other users who's sync has failed.Use the ' Mark' tool and copy the GUID to the clipboard and store in a Notepad document for safekeeping.Use this command to glean mailbox GUID (Edit Primary SMTP Address):.Logon to Exchange Server with Exchange Powershell Access.

Solution For issues where the GUID has been changed, follow these steps For Cloudlink synchronizations:

After a scheduled/manual user sync using CloudLink or O365 Sync, the administrative contact(s) receive a user synchronization failure notification email from Error Message
