You can add as many members to your Teamspace as you'd like. If you are on a paid plan, you will be charged for an additional seat for each member who accepts the invitation.
How billing works:
You're only charged when someone actually joins, not when you send the invitation.
Each new member adds one seat to your current plan at the same rate.
Billing is prorated - you pay for the remaining days in your current billing cycle.
Example: If a member joins halfway through a monthly billing period, the additional seat costs approximately half the monthly seat price for that first period. The exact charge depends on your plan, currency, billing frequency, join date, and taxes; review the invoice for the amount.