In the guidance section of the form it states: “If your principal is not an ACCA member, we will need to carry out a status check with their professional body. You should provide the name of your principal’s professional body, membership number, postcode and date of birth as some professional bodies will not respond to status checks from ACCA without this information. Your principal must have been eligible to act as such throughout the period they have signed off in your PCEF.”
I suggest contacting ACCA directly for most reliable guidance.