Hi @therockstaraccountant here your querry answer:
When dealing with foreign partners in a US partnership that do not have US Social Security Numbers (SSN), Employer Identification Numbers (EIN), or Taxpayer Identification Numbers (TIN), you may need to file the returns manually. ProConnect may not support the automatic e-filing of partnership returns in this scenario, as the lack of a valid US identification number can result in e-filing rejection.

To ensure compliance and accurate filing, consider reaching out to a tax professional or the IRS for guidance on how to proceed with filing manually and meeting all necessary requirements for foreign partners in your specific situation.