Stamping visitor visas in children passports

[Kateryna Zakharchenko]

Hello, dear members!
I have work permit under CUAET program. And my two kids had study permits. Their passports were expired and I applied for extension their study permits and stamping visitor visas to their new passports. I received by mail new study permits and then new visitor records but no original passport requests for stamping visas. Could you help me please? What should I do to stamp visas to their passports? Thank you so much.