A: Your Billing admin can add support licenses in the Billing portal:
- Go to Settings → Account → Billing portal.
- Click Used support licenses (Edit support seats).
- Click + to raise Total support seats.
- Check I am authorized to complete the purchase and click Add (for example Add 2 support licenses).
When you give a user a support license in Settings → Account → Users & roles and none are left, a Billing admin can also click Buy more support licenses there.
If your account has a special discount, changes to your agreement are made through your account manager. If the + button is greyed out, contact support to add more support licenses.