Failed to sync the ArchiveGuid of mailbox GUID because one cloud archive GUID exists

How to fix Office 365 error - Failed to sync the ArchiveGuid 00000000-0000-0000-0000-000000000000 of mailbox GUID because one cloud archive GUID exists

Office 365 Exchange Online mailbox error:

Exchange: Failed to sync the ArchiveGuid 00000000-0000-0000-0000-000000000000 of mailbox GUID because one cloud archive GUID exists..; Exchange: An unknown error has occurred. 

• This error is caused by a mismatch between the on-premises and Exchange online values for the archive mailbox guid
  

• The fix is to get the archive mailbox details from Exchange online and update them in the AD user object on-premises

You might also see the error - We are preparing a mailbox for the user

Reference:

Validation errors for a mailbox archive GUID for Microsoft 365 users
https://docs.microsoft.com/en-us/exchange/troubleshoot/administration/validation-errors-for-mailbox-archive-guid

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Steps to fix - Failed to sync the ArchiveGuid of mailbox

1. Get the users Exchange online archive details

Run the Get-Mailbox PowerShell command to get details of the users Exchange online archive

# Connect to Exchange online 
Connect-MsolService

# Get the users Exchange online archive details
Get-Mailbox user@domain.com | FL Archive*
 

Note the ArchiveGuid and ArchiveName

2. Convert the archive guid to hexadecimal

Use this PowerShell to convert the ArchiveGuid to a hexadecimal value

Replace "ArchiveGuid" with the archive mailbox guid from step 1
e.g.  "72452cd5-1b8b-4d78-95f9-f384698cfa65"

[system.guid]$guid = "ArchiveGuid"
 ($Guid.ToByteArray() | foreach { $_.ToString('x2') }) -Join ' ' 

Copy the hexadecimal value 
e.g. d5 2c 45 72 8b 1b 78 4d 95 f9 f3 84 69 8c fa 65

3. Update the users Exchange online archive details in Active Directory

AD Users and Computers - AD user object - properties

Attribute Editor - check the mailNickname has been set

Edit msExchArchiveGUID and copy the hexadecimal value of the archive guid from step 2

Edit msExchArchiveName and copy the ArchiveName without the brackets from step 1 
e.g. {In-Place Archive -Firstname Lastname}

Edit msExchRemoteRecipientType and set the value to 3

Remote Recipient Type value 3 is ProvisionMailbox, ProvisionArchive

4. Run AD connect directory sync

Run the following PowerShell command from your AD connect server to sync the changes to Office 365

Start-ADSyncSyncCycle -PolicyType Delta