WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Piece Of Tape In Front Of Clip
Courtesy of VOLVO CARS OF NORTH AMERICA.
Check that there is tape on the side of the dashboard mating surface to the cover.
Tape missing, install a piece, P/N 3537456-0, in front of the clip cut out and a bit behind (on both sides).