Started inviting friends around february with no response or mailing from turbotax. Worked once out of 6 times.
[Edit Note 5/13-2022 at 1:35 AM Pacific:
Also be aware that it can take up to 45 days after the friend redeems their special offer. See terms: https://turbotax.intuit.com/referral/terms ]
Did you send the special link to the friends, and did the friends use the link and finished and filed with TurboTax? See this FAQ about the Invite a Friend program to be sure your friends fulfilled the requirements. It also contains a contact link.
FAQ: Learn about the TurboTax Invite a Friend Program
If it's been longer than 45 days, at the bottom of the FAQ you will see a blue section "What if I referred my friend, they completed their taxes with TurboTax, but I never got a reward?"
Click that section to expand, and you'll see a contact link.
Also be aware that it can take up to 45 days after the friend has filed. I added that info above.