Help HN: Does LinkedIn have the worst sign up process ever?

I'm trying to create an account on LinkedIn, but after I give the name, email and password the platform asks me to enter a verification code sent to my phone. The verification code arrived to my phone 30 minutes after e requested it and the page to insert the code already expired. Now, LinkedIn says that I can't use that phone number a suggests to try with another one, but I already tried with 3 different numbers and it says the same! I tried to find a contact form in the website to report this issue, but didn't find nothing. I'm kind in a dead end. It almost seems that they don't want people to sign up. It's probably the worst user experience in terms of registration that I saw in my entire life.