If users are having trouble receiving your Invitation to Join the team, you can send the member a direct link to join the team from your personal email account.
To find the player’s unique, individual link, click on their name on the Roster tab. On their Player Page, copy their Invitation Link.
Create an email to this user from your personal email account, and paste the Invitation Link in the email. The user can now follow this link to join your team.