Unable to Sign in as Guest in Teams

If you do not have a work / personal account, you may have trouble signing in as a guest to teams.  You may either register a personal account, or utilize the guest sign in method detailed below:

1. In a new session, open https://teams.microsoft.com/
2. Click Sign-in options
3. Click sign into an organization
4. Type in domain of the company you're trying to sign into.  This would not be your domain, but the company that invited you.  
5. Type in your email (your email)
6. A code will be sent to your email. Enter the code from the email into the box.
7. Complete any other sign in steps that may be prompted.
8. Should be able to use teams now.