I'd be glad to offer my assistance in changing your login password for QuickBooks Online.
You can change your password by clicking the I forgot my user ID or Password link from the Sign in page. Since you can't access the phone, you can enter your email address instead of the phone number, then you should receive a message that allows you to reset the password of your login credentials.
If you still can't access your account, I'd suggest contacting our QuickBooks Customer Care Team so they can pull up your account in a secure environment and change it for you.
keep me posted on how this goes, I’m just a couple of clicks away. Wishing
you continued success.
You can simply reset your QuickBooks Password by following the below steps:
You see the login screen in the QuickBooks desktop, Select I forgot my password.
Answer the security question and click OK.
Just press on Close when you see this message: “ When you removed the password and challenge answer and the question then your company file is no longer password-protected. When you nearby this window, then you create a new password and select and answer your challenge question.”
Open the window then change the QuickBooks password.
Then enter a new password and new challenge question.
I hope you have successfully "change login password of your company file in QuickBooks". However, If you are still unable and solution steps doesn't Help, So that condition i would suggest you to visit the below mention article link.