If you are trying to finalize the registration to request the card and the system rejects any field, do the following:
Review the text you entered (name, address, complement, city, etc.).
Remove accents, special symbols, and cedilla, for example:
João→JoaoSão Paulo→Sao PauloCoração→CoracaoMüller→Muller
Use only simple letters, numbers, and spaces.
After adjusting, try submitting the form again.
Does this change my “real” data?
No.
This is just a technical limitation of field input in the system.
Your name remains your official name, with all accents and cedillas;
The data is used normally for registration and analysis purposes, even without accents in the system.