Whenever my account users try to login, incorrect username

Hi there, zebamehveen0012-.

I'm here to assist your user in gaining access to their account.

Did they try to reset their password? If so, the browser may have saved the old credential. We can perform some browser troubleshooting steps to fix this.

Let's start by accessing their account using an incognito browser. This mode doesn't store any site data. Here are the following shortcut keys:

• Google Chrome: press Ctrl + Shift + N.
• Mozilla Firefox: press Ctrl + Shift + P.
• Safari: press Command + Shift + N

If it works, they can go back to their normal browser and clear the cache to get rid of the stored internet files. Alternatively, you can use a different browser.

Additionally, you can remove and re-add the user since there might be some issue with their login. You can follow the steps on this article for the complete instructions: Add and manage users in QuickBooks Online.

Let me know if you need further assistance with the login. I'll get back with more details to help you.