WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Vacuum hose connection -1-
Fig 1: Locating Hose Clamp -1-
Courtesy of AUDI OF AMERICA, LLC
NOTE:
Before assembling the vacuum hose, slide the new hose clamp -1- over the vacuum hose.