Take all the tension off the awning before trying anything. The awning should be slack and flopping before trying to move the bead. It's funny how easy it is to pull it out more but how it won't slide back in.
Pulling it all the way out and sliding a wire through the opening attached to the bead might work. Be sure there's nothing that might get hooked inside the fabric as you pull it back in. Maybe better with some heave fishing line? Poke/drill a tiny hole to loop the line through. Hold the far end of the awning fabric so it won't bunch up while trying to pull the bead back in from the other side. A little silicone spray might help it slide.