Ask for a supervisor — the system to transfer over 50K has been down for awhile now but the way they got me 80K points was to transfer 50K normally and then supervisor manually added/removed 30K from respective accounts.

Please note that the rules only allow for over 50K transfer to be done for the purposes of making a reservation so, to be on the safe side, I made a booking that left me 80K points short and then called in to get the transfer done. Then cancelled reservation, points got refunded and called in later to book a TP.

Also, not every CSR is even aware that over 50K transfers are allowed so if you get pushback - try again.