QB Issue Resolution:

If you leave the computer on, and leave the browser tab open that you use for QBO, you can log in and not get the nanny prompt code.  The browser tab is what resets the intuit prompt, close the tab and you can expect the prompt

Or if you use intuits windows QBO app, for some reason intuit trusts that app and you do not get the nanny prompt.  Odd considering that the app is on the same computer as the browser.

Resolution for Issue 'How do I deactivate the login 6 digit code text/email verification for QuickBooks online? I am getting prompted for it way too often from same PC and IP address.' available: Yes (Solved).
Source: Intuit Community forum.

How do I deactivate the login 6 digit code text/email verification for QuickBooks online? I am getting prompted for it way too often from same PC and IP address.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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