The PIN will have a length of 3 alphanumeric characters and it is generated by the Tax Agency.
The PIN you will receive on your mobile phone may have letters (excluding eñe) and/or digits (excluding zero, one, eight and nine).
For example, if you receive "XOI", the characters you should enter on the authentication screen will be the letters "equis", "o" and "i".
The PIN plus the key provided by us at the time of request of the same, configure the access code that allows the procedures to be carried out electronically