I tried to register on eOI Portal, but the system does not accept my PIN or password, and reports an error "Invalid PIN or password".

For a successful registration on the Portal, it is required to have an initial password which is contained in the security envelope that you will receive during the presentation of the electronic identity card. Registration on the Portal is not possible without this information. When you enter the initial password, you should also pay attention to small and large letters, whether the caps lock is turned on, make sure whether it is necessary to enter character zero or the letter O and the distribution of letters Y / Z on your keyboard.