Hello and welcome to TFP! The loss of suction might simply be that too much air got into the line or system when you first tried. Did you ensure to submerge the vacuum hose full of water before connecting it to the pump or suction line?
I don't have your same system, but typically yes. Anything on the suction side (from poolside intake/suction all the way to the pump) should be full of water with all air purged.
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