How to change primary admin when QBO cannot send a verification code?

Let me provide some details as to why you're not receiving a verification code, gkeys. 

We often assume that the phone number in your Intuit account is correct since it will only display selected numbers of your phone number. Make sure that you're typing in the correct phone number. I've added a screenshot for reference: 
 

Aside from that, you can log into your Intuit account and ensure to select the correct option so you'll be able to receive the verification code. I've outlined the steps to show you how:

1. Log in to your Intuit account.
2. Select Sign In & Security from the left menu.
3. In the Two-step verification field, select Turn on.
4. Ensure your phone number is correct, and select Text message to receive a standard six-digit verification text code.
   
5. Click Turn on. Then, enter the code.
6. Once done, click Continue.

On the other hand, if you're still having issues, receiving the code, you can learn how to change the new primary admin so he can access everything in the QuickBooks Online account, and manage all user and admin tasks. You can go through this article for more details: Change the Primary Admin User in QuickBooks Online.

Let us know if you have further questions about receiving codes or managing users.  We're always right here to get you covered. Have a nice day!