WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
-- Free up the roof end strip -2- near the rear lid seal -1-.
Fig 1: Roof End Strip
Courtesy of AUDI OF AMERICA, LLC
-- Unclip the roof end strip -2- using the Trim Removal Wedge :3409
-arrows-.