Just purchased a new 2025 Yukon Denali with the Denali Reserve/Enhanced Trailering Technology Package. I also purchased the GMC trailer accessory camera. This package is supposed to show guidelines behind the trailer when backing the trailer up in reverse, but I can't seem to activate them. The guidelines show in reverse without the trailer. The accessory camera works/shows what's behind the trailer, but no guide lines. Any ideas on how to activate this? Thanks!