QB Issue Resolution:

Each business is distinct, that they share an address makes no difference, I have three that all use the same address. Just fill in the tax form per business.

Two of them share a sales tax number, an the other has its own sales tax number – same address again, even the state does not care.  (in Texas a sole proprietor only needs one sales tax number)

Resolution for Issue 'What are the legal requirements for 2 separate businesses filing taxes under a matching address?' available: Yes (Solved).
Source: Intuit Community forum.

What are the legal requirements for 2 separate businesses filing taxes under a matching address?: 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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