Hello I have been trying to purchase a couple things for a friend for a day now and keep getting error:

You cannot use this function.
Please contact the SQUARE ENIX Support Center for additional details.
Error Code: i2501

Ive tried different computers, browsers, phones, connections, incognito mode. Please, its the friends birthday SE and I am just trying to give you money, but like often times, it is for some reason difficult to do so. Please help me resolve this asap.