Native American study advertised on Grindr, does anyone know it?

I was on a Grindr awhile ago and they had a pop up about a study asking for Native Americans. I clicked on it but they didn't have a contact form, only a phone number, and I didn't have time to call at the time. Well I forgot about it until today and I closed all tabs awhile ago so it's gone. Does anyone know what study this is?