One of my users in my organisation is locked out of Quickbooks and is unable to reset their password only with their email ID.

Good to see you here, maanas. 

I'm here to ensure you'll be able to reset your password so you can get back to business. 

We have different ways on how to modify your password in QuickBooks Online. Instead of using the email address, you can use your phone number if you still have to access it. 

Here's how: 

1. Sign in to QuickBooks Online.
2. Click I forgot my user ID or Password on the bottom part.
3. From there key in your phone number in the field box and click Continue.
4. Enter the 6-digit code then click Continue. 
5. Complete the following prompts to reset your password. 

For additional reference, I've attached a link you can use to reset the account user ID in QuickBooks: Get help if you can't sign in to your account.

If you are unable to sign in, you can send us a request to recover your account. Once you get back into your account, you can use the steps in the section above to change your user ID or email if you want

If the issue persists, I suggest reaching out to our Customer Care Team. One of them will be able to pull up your account and further help you update the details.

1. Click the Help menu in the upper-right-hand corner.
2. Type in "Talk to a human", then press Enter.
3. Look for I still need a human and click on it.
4. Click Get help from a human or Contact Support Team.
5. Select between Send a message, Schedule an appointment, or Get a callback.

To make sure you get prioritized on your concern. Please check out our support hours and contact us at a time convenient: Support hours and types.

I'm only a few clicks away if you have other concerns about login issues in QBO. Take care always. It's always my pleasure to help you out again.