ISSUE: Nullable object must have a value error message

Overview

Configure message size limit may fail with the following error:

"Nullable object must have a value. [Start]"

The store message size limit task failed so the MaxSend and MaxReceive limit in database for that user is set to NULL.

Solution

1. Go to tenant database

2. Run following query against dbo.Mailboxes table:

update Mailboxes set MaxReceiveSize=55,MaxSendSize=55 where id in (select ExchangeMailboxId from MailArchiveMigrationMappings where Id in (select MigrationProcessId from ProcessSteps where StepErrorText like 'Nullable object must have a value.%'))

NOTE: MaxReceiveSize=55,MaxSendSize=55 is value in MB and can be adjust per needs.

3. After you ran the query, restart the failed step in Onboarding Progress page