There is no available information that confirms Taylor Swift being the background singer for Beyonce's song "Bodyguard" on her new album "Cowboy Carter" released on March 29, 2024. Genius, a "company [that] enables users to annotate song lyrics with interpretations about each line’s meaning [and also] publishes news stories and features about artists," showed a user list Taylor Swift in the credit section on the "Bodyguard page" (Genuis/Bodyguard, Twitter). However, it was quickly deleted by another user, according to Snopes, a fact-checking website. Additionally, Beyonce's official website has not listed the complete credits for the song. A press release from Beyonce's team listed her album contributors, "Beyoncé ensconced herself with a stellar group of collaborators, including The-Dream, Pharrell, NO I.D., Raphael Saadiq, Ryan Tedder, Ryan Beatty, Swizz Beatz, Khirye Tyler, Derek Dixie, Ink, Nova Wav, Mamii, Cam, Tyler Johnson, Dave Hamelin, and Shawn "JAY-Z" Carter to find the secret gems in each song. The process, sometimes years in the making, often meant combining pieces of different recordings, changing the instrumentation here, adding a snare there, to land at the perfect spot in the right time. …
And the musical alliance here includes contributions from an impressive list of artists as vocalists, musicians, and orators, including Dolly Parton, Willie Nelson, Linda Martell, Stevie Wonder, Chuck Berry, Mylie Cyrus, Post Malone, Jon Batiste, Rhiannon Giddens, Nile Rodgers, Robert Randolph, Gary Clark, Jr., Willie Jones, Brittney Spencer, Shaboozey, Reyna Roberts, Tanner Adell and Tiera Kennedy."
Whether or not Swift was an unnamed contributor to any part of the album, there is no confirmation from any additional source that says Swift was a background singer.