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Batch Operations: Resync Contact Ids and Tags only for users that have no contact Id
This would request would be very similar to "Resync contact IDs and tags for every user" except that it would only Resync those WordPress users that have "(no contact ID)".
Use case: I have a 3rd Party App that syncs/creates "WordPress Users" but does not add the ActiveCampaign contact Id to the WordPress User. Without the Id tags will not sync.
Also, having a batch process that only checks users that do not have contact Id could/should save time vs updating every user.
Kim Stone shared this idea 
I think this is too niche to add to the plugin, but I’ve added an example for you at https://wpfusion.com/documentation/advanced-developer-tutorials/registering-custom-batch-operations/#resync-tags-no-contact-id. You can copy that into your functions.php to register the new operation.