Myth Auth strong_password

PHP Code:

    public $personalFields = [
        'company_name', 'company_vat', 'company_coc', 'first_name', 'last_name', 
        'address', 'number', 'extra_nr', 'zipcode', 'city', 'country', 'phone', 'comments'
    ]; 


Really big list.
In your case validation goes thru NothingPersonalValidator.php class - isNotPersonal() method.
This method looks for personal information in a password. For example first of all it checks is your password equal to your username or email address or the reversed username.
If you have also filled $personalFields , then method will also get there values too to look for personal information. Considering 13 variables in your list there is really big chance that validation will fail.
For example: in "number" field you have a value "95". In this situation validation will fail.
Quick solution in your case is comment from $passwordValidators array nothingPersonalValidator class.