What is the process for changing your address to a different province with Thai immigration, and can they refuse this request?

To change your address to a different province in Thailand, you generally need to file a new TM30 form, which your landlord can submit online or at the local immigration office. This should be done in conjunction with your 90-day report at your local immigration office using your new address. If the new TM30 is not filed or present in the immigration system, you may be required to provide it before your 90-day report is accepted. There is typically no reason for immigration to refuse this request if you have physically moved; they simply need to update their records.