Archive and Retention Policy troubleshooting

Place a mailbox on retention hold

Placing a mailbox on retention hold suspends the processing of an MRM retention policy by the Managed Folder Assistant for that mailbox. Retention hold is designed for situations such as a user being on vacation or away temporarily.

During retention hold, users can log on to their mailbox and change or delete items. When you perform a mailbox search, deleted items that are past the deleted item retention period aren't returned in search results. To make sure items changed or deleted by users are preserved in legal hold scenarios, you must place a mailbox on legal hold.

Set-Mailbox "Mail User" -RetentionHoldEnabled $true/$false

Note: Use true and false for enabling and disabling retention hold

To use Managed Folder Assistant on mailbox with hold enabled,

Set-Mailbox [e-mail] -ElcProcessingDisabled $false
Start-ManagedFolderAssistant -Identity [e-mail]

Move emails to archive through retention policy

Follow the below command in exchange online PowerShell and run the below command:

New-RetentionPolicyTag -Name <Name of RPT> -Type All -AgeLimitForRetention 365 -RetentionAction MoveToArchive

New-RetentionPolicy "Policy name" -RetentionPolicyTagLinks "tag name"

Set-Mailbox -Identity <id> -RetentionPolicy "Policy name"

Also please run the MRM: Start-ManagedFolderAssistant -Identity "email id"

To move the items to archive folder in exchange online powershell.

Set-Mailbox [e-mail] -ElcProcessingDisabled $false
Start-ManagedFolderAssistant -Identity [e-mail]

Microsoft Reference: https://docs.microsoft.com/en-us/exchange/security-and-compliance/messaging-records-management/mailbox-retention-hold