Activated 5 employees UAN on 25 of May 2019 - checking the passbook it shows "passbook not available"

I've activated 5 employees UAN on 25 of May 2019. Today when I'm checking the passbook it shows "passbook not available".
Please some one tell me why this happened...?

Dear Friend,
As you said, you have activated UAN on 25/05/2019 so their contributions will be paid by 15th June, when there is no contribution paid then how is it possible to view a passbook.

But the employee's Joining date is "28-03-2018", from starting only their salary PF Amount is deducting by Employer.

Dear Friend,
Are they covered under a Trust ?

not at all brother
Starting only PF amount deducting from salary, when I joined I asked about this HR said UAN number is there but not activated. So I did the activation and checked after one week. While opening Passbook its showing "Passbook not available"
Pls advice me on next step...