Using HSA for Peloton?

So I’ve been debating purchasing a peloton recently and saw that there was an option to use your HSA for it. Now for a smidge of backstory, I’ve always been slightly overweight my adult life, and it’s gotten progressively worse as I approach 30. I have a lot of weight related illness within my family, so I’m hoping using their TruMed option will grant the LMN, but my ultimate question is for anyone who has used it. I saw I have to put in my HSA card info as I fill out the assessment. If I were to not receive the LMN, what happens then? I saw it say I could cancel if it’s not approved, but are they still charging my HSA or what?

I’ve tried to find other reddit posts about this, but they’re mostly a few years old and most of the content is either “yep I was approved” or “I wasn’t approved” but nothing further about the actual process.

Thanks in advance!