Can someone please help me understand the following?

If Zoho Vault architecture is truly zero knowledge and the credentials are decrypted at the client-side by the master password, how does password (credential) sharing with others even work? I've a Team subscription and have shared a couple of credentials with my team members. They don't know my master password and cannot access my vault. Then how can they access the shared password if Zoho does not have any knowledge of it?