Will the access permissions I've granted to third parties in the MOVE B2B portal (e.g. tenants, co-owners, or other users) carry over automatically to the JOYA B2B portal?

Yes, all permissions you've granted stay exactly as they are and will be carried over to the new portal.
Will my current settings from the MOVE B2B portal (including compensation rates per station, alerts like offline status) be kept in the JOYA B2B portal?
Non deve fare nulla. Le carte di ricarica esistenti restano valide, e i Suoi conducenti riceveranno da noi un invito a utilizzare la nuova app JOYA - senza alcun obbligo.