US Customs and Border Protection Customer Service Issues

I am the beneficiary of an I-[redacted] application that was recently approved. I have a specific inquiry regarding my case. During my conversation with a USCIS representative, I was advised to reach out to CBP for further assistance. My question is this: Can I include my common-law partner in my application now, even though their details were not included in the original I-[redacted] application? The USCIS website suggests that this may be feasible, but I prefer to confirm with CBP first, per the guidance from the USCIS representative. According to the USCIS website, it states: "Adding travel group members You can add an eligible travel group member, regardless of their age, at any time before submitting your information to CBP. Note: You will not be able to add any members to your travel group after you receive your travel authorization." However, this section of the website is causing some uncertainty: "You may add your immediate family members to your travel group if they are the beneficiary of a confirmed Form I-[redacted]."

Dear Officer, I am reaching out to request a Traveler Authorization Document for my brother for his future travel. Obtaining this document promptly is vital for his upcoming trip, and we are hopeful for your assistance in issuing it efficiently. We are aware of the significance of adhering to the necessary procedures and are committed to meeting all requirements. Your help in this matter is highly appreciated, and we are eager to ensure everything is in order for his journey. Thank you for your attention to this request. Sincerely, [Your Name]