I get the email every now and then saying TurboTax ran the numbers/did the soft inquiry, and I'd very much like for that to stop.
Those soft inquiries do not affect your credit score.
See https://turbo.intuit.com/blog/credit-score/soft-vs-hard-credit-check-2694/
If you would like to terminate your relationship or have questions contact the Processing Agent directly at 1-844-846-6245