If you're LULUS before, then now this "permohonan diterima" because of new registration? I see, you are probably making a mistake... Do you have screenshot LULUS page?

If any of you here are having this problem, recheck and confirm again, but don't click "Permohonan Baru".
Always remember to backup, screenshot/print the LULUS page, just in case for evidence.
No deadline (might change later, who knows), as BPN registration deadline is 30 April, same as first payment.

Bring IC copy, salary / pay slip, marriage or divorce JPN documents, children birth cert, any other.

Are you currently register for your dad?
Well, it is better to have his own bank account... you know, when they transfer the money, they need name of the bank, I afraid you put other people bank detail, your application got rejected.
https://bpn.hasil.gov.my/SemakanStatusBPN.aspx
https://bpn.hasil.gov.my/

Only BSH 2019/2020 is eligible for BPN automatically, means don't need to apply BPN.
Ask him did he receive BSH2019 before?

For the case like this, I'm not sure you can register different account detail than the owner of BPN account, if you know what I mean. You probably need to consult / ask KWSP staff for this.
Just refresh the page will do

I just registered in BPN after the captcha thingy and accept the terms & conditions. after that tekan "Yes" terus blank. so its accepted or not ?

LHDN, if your bank account is still active, don't worry then.
Yes you can. But fyi, your father must have bank account because when you apply, there is bank account section for your father to fill too. At the end, cannot. You can try your luck by visit the LHDN office.