The locking pawl is probably frozen or corroded or the spring is broken. You will need to disassemble that end of the awning. If you have never done this before, there is a lot of spring tension there and it can be dangerous. Try hosing it good with WD-40 to get it loose and then keep it lubricated.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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