1099 K PLEASE HELP

Hello, I am currently using TurboTax to file this year. I work as a freelance consultant.  I have two clients, both of which are individuals (i.e. not businesses technically) and I am paid through Venmo. I'm filling out two 1099-Ks; I do not make enough for Venmo to send me one. The form is asking for a Filer's federal ID number (TIN). If I'm understanding correctly the "Filer" is my client. How do I get a TIN number for them??