Unlock code is incorrect

I play POE2 completely from my home only from the start of AT.
Because of my ISP (maybe, I'm not sure), the game several times detected my login in another location, so it asked me to fill the unlock code which was sent via the email separately.
Till before yesterday, everything worked well for me, I could grab the code from the email, fill it then login and enjoy the game.
However, from yesterday, something wrong occurred, the game kept saying "the unlock code is incorrect", even though I'm 100% sure I typed it correctly as the email. Another weird situation is I always received the same unlock code regardless how many times that I tried to request "Resend Email". It's weird because several last times, I always received different unlock code.
I guess maybe there is something wrong with the unlock system atm, but don't know how to resolve it now, sent the email to support but no response until now.
I really want to enjoy the game in this holiday, but I'm afraid that I cannot with current situation and no support from GGG like this, so post it here, hope someone from GGG will be aware about that.

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