What could be causing my money transfer to Bangkok Bank to be returned?

One additional note that may be of use is 2 years ago when I first came to Thailand I transferred money from my home Bank to Bangkok Bank in Thailand using wire transfer Swift and it was then that my bank in Canada did not include my middle name when transferring it to my Bangkok Bank and it was rejected then also it went through successfully when my bank finally did include my middle name as listed in my Bangkok bank account

During my previously mentioned issue I did phone Bangkok Bank and they inform me that everything with my account was okay and that I could receive transfers. They did not tell me about including the middle name that was figured out on my own

I had the same problem using the remitly app my bank is at Bangkok Bank also. In some apps we only put our first and last name but our account at Bangkok Bank made with their passport would include the middle name. I had no problem for 2 years and then recently increase in security due to money laundering scams and fraudulent activity all the banks are clamping down. If you use your middle name at Bangkok Bank for your account you need to ensure that you utilize that middle name as the recipient when you use your transfer app to that bank. Once I fixed that there has been no problem. Cheers

There are new regulations regarding transfers. Its best to transfer under 50,000 baht per transaction.

Are you sending it with Wise? There have been problems with Wise lately

Don't know as I haven't had that problem. If you are in Thailand go ask the bank.