If on checking your Npower NASIMS payroll payment portal it displayed "Invalid Account" and you were not paid because of this issue, it simply means your account is placed on hold or probably there is a limit to the amount of credit your account can take at a time, please this is not a serious issue, this is just to control congestion during the payment process, and you will soon be credited.
Please if you are facing this issue and you have not been paid at all, you can visit your bank to pin point the exact issue, there might be a cap or limit placed on your account and there might be a transaction bottle neck somewhere, as said earlier this is not really an issue to worry about if you have been paid before.
Most times the payment system flags for invalid account when a suspicious transaction is noticed, just exercise patience and you will be paid.

What about the account of those that are still displaying failed "no action is taken " especially for Oct stipend

The Nasim care line is about the worse out there. They hardly fix issues sent vial emails and they hardly take calls. I was even lucky to get a reply to the email that the account issue has been fixed after providing BVN printout stamped and signed at the bank. That was before the second payment. Till now, the issue is not fixed. The fact that the current NPower has no office in each State is worse. Finally, they still don't resolve issues sent to them on twitter. In conclusion, their handling of queries is crap.

ezenwaez:
If on checking your Npower NASIMS payroll payment portal it displayed "Invalid Account" and you were not paid because of this issue, it simply means your account is placed on hold or probably there is a limit to the amount of credit your account can take at a time, please this is not a serious issue, this is just to control congestion during the payment process, and you will soon be credited.
Please if you are facing this issue and you have not been paid at all, you can visit your bank to pin point the exact issue, there might be a cap or limit placed on your account and there might be a transaction bottle neck somewhere, as said earlier this is not really an issue to worry about if you have been paid before.
Most times the payment system flags for invalid account when a suspicious transaction is noticed, just exercise patience and you will be paid.

what of this transfer not successful issue? What do I do?

On my payroll, there is no entry for Oct but I was paid. What could be the reason? I am still waiting for November, though.

cotmag:
On my payroll, there is no entry for Oct but I was paid. What could be the reason? I am still waiting for November, though.

It's just a network issue