Question about W-9: Employer's online form only let's me input my SSN, and not my EIN

One of my employers is changing their payments systems to Tipalti and they are requesting a W-9 from me.

 

Unfortunately, their system for their online W-9 form doesn't accept my EIN number, but I've always filled it out that way.

 

They are telling to just use my SSN number, but I told them that I've always used my EIN number.

 

Is it OK that I submit this form using my SSN instead of my EIN?