Zoom Phone says “You have used all your available credit”

Hello,

Whenever I try to make a call using Zoom Phone, I receive the following message: “You have used all your available credit, please contact your account administrator.”

The problem is that I am the person who created the Zoom account, and I am trying to make calls using my own account. I live in Canada, and I would like to understand why this message appears and how I can fix it.

Could someone explain why this is happening and tell me what settings I need to check to enable outgoing calls?

Thank you for your help!