I've logged on for the first time two days ago on a corporate Claude account.

It took like 40 minutes and worked like this:

1. Sign in to the site, get the onboarding screen, download clients.

2. Run a client, it triggers an email with a link to open on the site so i can authenticate it.

3. Instead of authenticating the client, the site sends me to the onboarding screen again.

4-20: repeat the above loop

21. finally get a code I can paste into the client.

I'm sure someone at Anthropic posted a blog entry with how fast they vibe coded the authentication code. Back before they claimed to have vibe coded a compiler that can do a linux kernel.