Loop tools bridge junction line

after connecting two objects with bridge, a perfect line is found at the junction of the two
applying the subdivision tool is even more evident

im new on blender so on the moment is a big nightmare for me :confused:

the vertex tool is active because I tried what I thought could work it being active is not the cause of the problem

yt video: https://www.youtube.com/watch?v=V2BB0041j0E

Hello and welcome!
From the looks of it, you have normals facing the wrong direction on parts of the mesh.
To check, go to Viewport Overlays > Geometry > Face Orientaion. By default, mesh will turn blue (forward facing polygons) and red (inverted).

Or simply select the mesh in Edit Mode and press Mesh > Normals > Recalculate Outside (Alt+ N) to recalculate normals.

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it worked thank you my dear blender god