I saw the same change from FTT code to TPP code on a friends VA compensation and SS compensation deposits each in a separate bank account at different branches of Bangkok Bank here in Chiang Mai. Bangkok Bank seems to be saying this change was caused by a change made by US Treasury funds disbursement group. Both changes showed up for first time on March 3rd transfers into the accounts. I did a Wise transfer to one of the accounts on same day using code for funds being used in Thailand for living expense. That went through as a FTT transaction. Chiang Mai Immigration says they will not accept a TPP transaction for the 65,000 Baht per month visa extension.