QB Issue Resolution:

There’s a self method in updating the email address on file but this method would require you to enter the User Id and the Password. If those pieces of information are not available, the other way is to contact our Customer Support and we can update the file for you.

To reach our support,

Go to http://intuitcar.es/contactquickbooksonline
Type Contact Us under Item 2 (What’s your question?)
The number to call can be found by clicking the Call button

Resolution for Issue 'Changing email address / Intuit account' available: Yes (Solved).
Source: Intuit Community forum.

Changing email address / Intuit account: 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 Desktop
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Additional Support Options: