QB Issue Resolution:

It sounds like you’ve downloaded the QuickBooks Online app instead of the QuickBooks Self-Employed app. Could you double-check on your app store to see if you downloaded the Self-Employed app?┬áThe two are different products and that’s why you’re having troubles logging into the app you’re using. The good thing is this is an easy fix. You’ll just need the right app and I’ll be here to steer you in the right direction. Let me know if you’ve got questions.

Resolution for Issue 'Quickbooks iOS says my Quickbooks self employed account cant be linked to mobile?' available: Yes (Solved).
Source: Intuit Community forum.

Quickbooks iOS says my Quickbooks self employed account cant be linked to mobile?: 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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