I don’t know your particular model but the Kampa air awnings that I have come across inflate, as Beachball says, from a single external point. The things to check are that all external deflation points ( usually one on each leg) are closed and that all internal connector valves are turned to open otherwise the air won’t circulate through all the tubes.
If you are pumping for ages and it’s not inflating then generally ( in the absence of a leak)it is one of the above two issues.
Mel