Can’t link TW B.Net account

HI ~
i am using to link my TW account
but it seems not work ~
i try to connect another region ( KR or US ) , and it will success to link.
but my account region is TW .
if i connet another region , i can not import my TW character.

i think this URL is the same problem , but i dont know how you fix it ?

can you give me any help ? thanks !