This article contains information regarding both signing in to an NBCUniversal account and signing in to a provider - which are two different things - at NBC.com.
"Account already exists": Sign In instead of going to Sign Up.
"We're unable to verify your email": Use a more popular provider (Gmail, Yahoo, etc.).
NBCUniversal account
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Links: Sign In | Sign Up | Edit Account | Reset Password*
*(check Spam; consider other email addresses) - Sign in the way the account was made: email, Google, or Apple.
- The Sign In link is often on the the bottom of the Sign Up page.
- Resetting other passwords: Google
Signing in to a provider
- Link your TV Provider to unlock live and locked content.
- Internet-only providers don't work.
- Use the provider's app or site to confirm or reset email, username or password.
- Use the primary address on the account to sign in.
- Your location matters.
- If your provider has pulled NBC, you can't watch online.
If the above doesn't apply, there may be a linking issue or an activation issue.