QB Issue Resolution:

I can see how it would be very frustrating not being able to save that number. QuickBooks Online does currently have an open investigation into the EIN/SS# not being able to save. I do not have a firm timeframe for when this investigation will be closed. We do have email information for your company though, so you’ll receive and email from us when we have any updates.

Let me know if you have any other questions 😀

Resolution for Issue 'EIN/SS# not saved in Comapny Settings' available: Yes (Solved).
Source: Intuit Community forum.

EIN/SS# not saved in Comapny Settings: 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 1099
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Error Recovery for 1099 [Canada]
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