OP: The likely reason why they ask you to open new account: In Brazil, you opened an account directly with the US IB LLC, while in Europe their licensed broker is IB UK. So european accounts are opened through IB UK (even though your money eventually ends up at IB LLC too).
Regarding other options, take a look at
https://www.degiro.eu/.
It looks like they are even cheaper than IB in some markets. Equally or better broad market offering.
I just came across recently as I read a news report about free ad supported stock trading from USAToday mentioning
https://www.deziro.com/, and I researched further to arrive at their parent Degiro, a dutch firm