System Error on login

It's my priority for you to log in and access your Intuit Online Payroll account, @GilbertCoco.

The log-in issue that you encounter may be due to security enhancements we have made. To resolve this issue update your account to a new Intuit account with enhanced security. I'll show you how.

1. Go to iop.intuit.com/login.
2. Follow the on-screen prompts to convert your account.
3. Then log in through your normal sign-in page. We recommend using this link iop.intuit.com/login2.jsp.

Also, have you switched to QuickBooks New Payroll Lineup? If so, you'll go to  qbo.intuit.com and use the same user ID and password you’ve always used. You can bookmark this page to make signing in easier.

If the issue continues to occur, I recommend contacting our Customer Support Team. They have the tools to check your account securely and let them review the cases created. Just click this link on how to reach them and choose Intuit Online Payroll: Contact Payroll Support.

I'd also encourage you to visit these articles below. These links contain a lot of information about payroll tasks and other related topics. 

• See what's new with QuickBooks Online Payroll Core, Premium, and Elite
• Payroll tasks: Resource hub

I'm always here to help if you have any other concerns or questions. Just tag my name in the comment section and I'll get back to you as soon as I can.

First of all, thank you so much for your help.
Yes, I would do anything like "Converting account" if I can login. You may see my picture attachment from the above posting. I am getting that error message on the screen after click "Sign In" button no matter which
login page I try. Since Intuit don't have phone support, I have to try to get support from chatting as you explain on your statement. Anyone would know if they have done chatting with support team.
It takes about an hour up to the point you hand over basic account information like phone number and business name for the chatting support team. If you can talk on the phone, it wouldn't take longer than 3 min though. I am doing the chatting with support team every day for over a month. I have to explain my situation from the scratch for the chat support team each time every day. Once they have read my explanation, then I have to wait for about another 30 min. I get exactly same message from the team said
"I created this case number for you. Our backend team will keep working on this issue. You will
get noticed when we solve the problem." I had an issue and tried to get some help from the chatting
support on May 27. The guy asked me permission to make change on my account and I said Yes.
That was the beginning of this disaster. Right after he did something, I couldn't
login since.

Thanks for updating this thread and adding some details about the issue, Gilbert.

We want to make sure this login issue is resolved so you can finish your payroll tasks. If you're still unable to get in or haven't heard from our support about the update of the issue, we need to have you contact them again. I know you already contacted them, but only our live support has the details and updates of your previous case ID with us.

At the moment, there isn't any open investigation for this error and we need to have them look into your account. This way, they can check why you're still getting this error message when you sign in.

Since you can't log in to Intuit Online Payroll, fill out this form to chat with an expert.

Post here again for updates on how things go. I want to keep track of this topic and make sure it is resolved for you. Have a good one!