We had a similar issue, or should I say issues. Long story ended up with our 2017 F350 6.7 L SD and our 2018 3660RL at the Ford dealer. Two issues: (1) the fuse was in place but blown, and (2) they found a small paragraph in a tech bulletin stating that, at times (and I may be paraphrasing) I would have to push the truck brake 3 times in order for the truck to recognize the RV. Seemed strange, but it worked. Haven't had a problem since.
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