QB Issue Resolution:

That’s because of Intuit’s new Multi-Factor Authentication.  See the article below for details.

https://community.intuit.com/articles/1164912-multi-factor-authentication-faq

Resolution for Issue 'why do i have to confirm my email every single time i log into QB?' available: Yes (Solved).
Source: Intuit Community forum.

why do i have to confirm my email every single time i log into QB?: 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.

Support for confirm
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Error Recovery for confirm [Canada]
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Additional Support Options: