On Your team, enter the person's email address, select an available Standard or Premium seat and choose Create invitation. The owner must have a seat available in the chosen category.
Copy the generated link and send it securely to the invited person. The invitation expires after seven days; treat the link as private and do not post it publicly.
An invitation reserves a seat while it is pending. If you cannot create one, check the available-seat count and the error shown on the team page.