Realized it was not needed to install a M.2 so returned it.
Response from lenovo.comBy Adrian_Lenovo, Customer Service, February 9, 2022
Lenovo appreciates all feedback and thank you for taking the time to rate and review our product! We want our customers to have a superb experience as you help us to continually evaluate our current products and services, and if necessary, change to meet your needs better.
[This review was collected as part of a promotion.] Item was very easy to install and worked perfectly for my second internal SSD. I don't understand why they wouldn't include this from the start, and it's odd that they bundle an extra piece with it (one is for the p340 tower, the other is for another unit, so you won't use both) but it works!