QB Issue Resolution:

There are things that you need to consider once you log in to your mobile app.

Make sure to download the correct application of your QuickBooks product.

After the download, you need to ensure that you’ve provided the same login credentials when logging in to your mobile app and web browser. However, if you’re still unable to log in to both. Let’s try some steps to help resolve this issue.

You can open a private browser to log in to your QuickBooks account. Then, go back to regular browser and clear the cache to delete any browsing history.

Next, try switching to a different browser.

Resolution for Issue 'I get an error when I log in. ‘There was an error during signing in. Please try again. I have not been able to log in. It is on my iPhone' available: Yes (Solved).
Source: Intuit Community forum.

I get an error when I log in. ‘There was an error during signing in. Please try again. I have not been able to log in. It is on my iPhone: 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 Login Credentials
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Error Recovery for Login Credentials [Canada]
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