Probably you're receiving the 2 factor authentication on your iPhone.
In this case you can put the 6 digit code after your password to confirm your purchase.
So let's imagine your password is dog@1234 and the code you're receiving in your device is 987654. You're going to type your password as dog@1234987654.
Plus, you can write in portuguese if you want.
I hope this can help you.
Good luck. Thanks!