using United MileagePlus Miles for TSA PreCheck renewal

My TSA precheck is up for renewal. This will be my first renewal after being approved back in 2017. United has an information page for using Miles "for a payment code that covers the TSA PreCheck fee for new and renewal applications". However, after signing in, the next page indicates using miles is for first-time applicants only. The first page says new applicants and renewals, but after the login, it says: "The payment code may only be used by first-time applicants."

Does anyone know if I will be able to use the code for renewals after I purchase it? I am at the point of having filled in my information where is says that my miles will be deducted, but here it also says that the purchase is for first-time applicants only.

Btw, I did write to United twice about this question over two weeks, but no answer, to a Premier Silver (now) member. First time poor experience. Very disappointing!

Update: None the wiser. I chatted with two United agents online for two hours, much of the time spent on them not knowing what to do and where to look. I was told by the first agent (Joshua L.) that after consulting with his lead, that they decided that TSA does not accept frequent flyer miles redemptions for renewals. I did not find it easy to believe this, because the TSA website says that loyalty programs can cover the cost of both first time applications and renewals, but please check with your airline. So, then I asked to be transferred to Mileageplus (because I think that there would be better information there) but where Jane N. informed me that the code is only allowed for renewal applications from first-time applicants. I asked how a first-time applicant can also renew at the same time, but this was repeated back to me enough times to make me wonder if this was a chatbot or a trained parrot. So, no logic and no clear answer.