@ubi-mark I heard a lot of the posts with this issue. I too had done the fishing quest with Tarben before building the fishing hut. It appears a lot of people have done this and now can't use the fishing line after building the fishing hut. Maybe there is a bug that prevents using the fishing line after that quest if the fishing hut wasn't built. Just thought I would throw it out there. Thanks!

I'm playing on ps5. I had a game save I had already finished the game with. I started another play through. I built the fishing hut and got the fishing line but it is always greyed out. I am not able to fish with it so I am unable to complete some word events. I am able to use it on my previous save file.