same here, also already written a post in the aerosoft forum without a solution so far
have tried it at EDDE, EDDV and EGLL (all standart scenery's and with ZIB B738)
also checked if the sam libary is automaticly attached to the scenery_pack.ini file, which is also correct.
also in the authority tool, there is no jetway available in a distance of 10km
until now, no SAM jetways