A common error that is received is "This team member has already been invited"
This error code flashes under the email that is attempting to be invited.
To Solve: Select the "Status" field to the right of the search bar, and change from the default "Active" to "All"
Once this is done, new users will appear (these are automatically imported from your CRM to be easily invited).
A few different status' may appear next to each person's name
Disabled
Pending Verification
Invited
Invite Expired
Confirmation Required
To "re-invite" the users, select the 3 dots to the left of their name and click Resend Invitation
The user will then have to go through the confirmation process of a new user. To find more help on that , look here.