QB Issue Resolution:

To change in QB, click on Company > My Company, then on the Edit icon (pencil). When the next screen opens, click on Company Identification (see insert).
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Resolution for Issue 'how to edit EIN in My Company?' available: Yes (Solved).
Source: Intuit Community forum.

how to edit EIN in My Company?: 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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