Changing velocity of Rigidbody2D via a coroutine failed to move player along the X-axis in two seperate instances. (Platformer)

I'm a college student who recently attempted to make a game project for an assignment, which was a 2D platformer game. The game had two systems in-place to change the player velocity (not with adding force, but with directly setting velocity and freezing the player movement), which was wall jumping and knockback. Both functions worked similarly, performed well in prototyping, but as I further developed my game, both ended up completely breaking. Despite debugging code and finding absolutely nothing wrong with the code, both functions could only move the player upwards, instead of to the upper right or upper left as they were intended to do. The player's input was frozen, the velocity had already been reset to 0 in an attempt to fix the bug, and no other functions affected the velocity of the player as the walljump and knockback functions ran. Print statements came out fine when I checked if the player velocity was being set, the functions worked, but for some unknown reason the player just could not be moved on the x axis in both situations.
I couldn't remember why the knockback function failed to work; and when the walljumping broke, it was likely after i had changed how wall collisions/player collisions worked (walls used a composite collided which had to be modified as to not render jagged polygons/cause player to get stuck or slide upwards on walls, but eventually the collisions were smoothed out and the wall sliding was fixed).

These problems were unable to be solved by the time the project was due, but I would like to get to the bottom of what could have caused it in order to make sure it doesn't happen again to future projects.

https://redd.it/1hl7cso
@r_Unity3D

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@r_Unity3D

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@r_Unity3D

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@r_Unity3D

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@r_Unity3D

Camera.Main returning null

https://preview.redd.it/bs8n67gtnt8e1.png?width=1148&format=png&auto=webp&s=19927c87d126bc809451e9c05923ce697d146618

https://preview.redd.it/jzsw6e1wnt8e1.png?width=790&format=png&auto=webp&s=a1aafe6a3795579c819be29e25575f3b62837c96

So I'm trying to reference camera.main, but I can't figure out why it's not working. I'm kind of a newbie, and no matter what information online they all say to just make sure that the main camera has the MainCamera tag, but it definetly does, so I have no idea why it's not working.

https://redd.it/1hlgvbu
@r_Unity3D

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@r_Unity3D

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@r_Unity3D

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@r_Unity3D