Can I submit my 90-day report in a different province than my registered address in Thailand?

The 90-day report must typically be submitted at the Immigration Office corresponding to your registered address. However, if you are traveling and staying temporarily at a different address, that new address must be registered with local authorities in order to submit the report there. Alternatively, you might be able to use the online reporting system if it's accessible, although it may not require you to mention your current location.