Once you receive an invitation email, follow the link and sign up for a SmartScope account.
If you already have a SmartScope account, sign in instead. You will now be able to access the new team, along with any teams you were already a part of.
Invites are sent to a specific email address. That same address must be used when logging in/signing up to access the new team.
If your new team does not show up upon logging in, double check the email you are using to access SmartScope. Make sure it matches the email to which the invitation was sent.
Log out and log back in/sign up with the exact email that received the invite to access the team.