The Giant Radio Array for Neutrino Detection (GRAND) is an envisioned next-generation observatory designed to detect ultra-high-energy (UHE) neutrinos, cosmic rays, and gamma rays with energies exceeding 100 PeV. GRAND will consist of multiple large-scale ground arrays of self-triggered radio antennas, aiming to detect the radio emission from extensive air showers initiated by these UHE particles. These arrays will be distributed around the globe at different sites, allowing for a rich science case. GRAND is being built and validated in stages, ensuring thorough testing of the detection principle and the required technology. As of 2024, three prototype arrays are in operation: GRANDProto300 in China, GRAND@Nançay in France, and GRAND@Auger in Argentina. The latter came to be as an agreement between the GRAND and Pierre Auger Collaborations, in which ten AERA (Auger Engineering Radio Array) stations were repurposed into GRAND detection units. This configuration is advantageous for the detection of air showers by both GRAND@Auger and the Pierre Auger detectors in coincidence. Through event-by-event comparisons, the detection principle and the reconstruction performance of GRAND can be evaluated. In this contribution, a summary of GRAND@Auger's commissioning and first results are presented.