HUCA, probably by phone.
Update:
Phone Reps are more useless than chat reps.
Still getting:
"There are two types of points:-
The points which you earn on your thank you card by using the card are (NON- TAXABLE POINTS) and it never expire until you have the card in use.
The point which you got as Bonus, by transferring or in offer are (TAXABLE POINTS) and it always expire on certain date
since you received them they became taxable on your account as you received them through sharing from your sisters accounts"
Anyone transfer TYP to TYP between 2 cardholders one of whom did not have a Premier or Prestige card and can still transfer TYP further to airlines?
ETA: Phone rep confirms TYP earned on any card besides Premier and Prestige once shared with other cardholder via points sharing becomes "taxable" points which means it may only be used for Travel Portal, cashback, GCs or shop with points.