I can share some information that can help you with receiving one-time passwords from QuickBooks, @MichaelC10.
Try to check your spam or junk folders and make sure to add Intuit's service-related email addresses to your safe sender list. This will ensure that you receive important and timely communication from these services.
Below are the sender addresses that you need to add:
Refer to this article for more information about receiving an accountant's copy and converting it to an accountant’s copy working file (.QBA) so you can make changes to their books: Use an Accountant's Copy working file in QuickBooks Desktop.
Here's more information on how you can update your accountant's copy working file to a regular company file in your desktop account: Convert an accountant's copy to a regular company file.
Let me know if you need further guidance opening your accountant's copy. I'm always here to assist. Have a wonderful day!