Not working on a number of fields

Hi,

I am using the field_validation (I've also tried FAPI and IFE) module in conjunction with clientside_validation. On the user register form, there are two fields not being validated. A name field (https://www.drupal.org/project/name) and a phone number field provided by https://www.drupal.org/project/sms_twilio

It seems like those required fields don't add a .error class after being submitted and left empty.

I've been searching all day for a solution in the various issue queues. Any guidance would be much appreciated.

#edit: when I disable clientside_validation and submit the form the fields do generate their required errors...