QB Issue Resolution:

The “new” button opens up in a pop-up window which are often blocked from opening in your browser.

You can click on the red box in the address bar to quickly enable them in Google Chrome.

Here is a link to their support article with step by step instructions: https://support.google.com/chrome/answer/95472?hl=en

Resolution for Issue 'Setting up new User.' available: Yes (Solved).
Source: Intuit Community forum.

Setting up new User.: 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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