What should I do if my landlord is unavailable to register my address after getting an ED visa in Thailand?

After obtaining a new ED visa in Thailand, you must register your address within 24 hours. If your landlord is unavailable, you can still register by bringing your rental agreement to the immigration office. You may also submit the TM30 without the landlord's signature, as immigration may only require the lease for this process. It's important to ensure this registration is completed to avoid issues with future visa extensions.