No, it is not necessary. The User mappings that were missed during the job creation will be listed under the ‘Edit Job’ -> Mapping Not Found Users [Please refer below screenshot] post Job execution.

You have the choice to add the missed mappings in the below ways

• For a private chat migration, we have the option to edit the mappings in the Edit Job option itself.

• For all other migrations, we can add the mappings in Settings -> User Mappings -> Application User Mappings [Please refer below screenshot]. Then run the job again using the option “Retry”.