1 hour ago, musicmaster said:In the file classes/address.php you find a table of fields that assigns the address validator to that field. You can find that validator in the classes/validate.php file.
Thank you Musicmaster,
I've removed the symbol '@' present in the string 356 of classes/Validate.php
OLD STRING: return empty($address) || preg_match(Tools::cleanNonUnicodeSupport('/^[^!<>?=+{}_$@%]*$/u'), $address);
NEW STRING: return empty($address) || preg_match(Tools::cleanNonUnicodeSupport('/^[^!<>?=+{}_$%]*$/u'), $address);
Now it works!