Yes, you’ll need TPIN authorization for each STP transaction on the scheduled dates if PoA/DDPI is not enabled.
For SoA format, the units are managed in folio mode, for which authorization is not required.
However, in the demat format, similar to how Equity works, every debit of mutual fund units from a demat account requires authorization (via TPIN & its OTP) or through DDPI, as mandated by regulation.
Also, the STP mechanism on Coin works differently from the traditional STP across the industry. More details here: