Symptoms of a bad axle?

[Cdubvw]

Hello, just checking in with you guys on what the symptoms of a worn would be. I have newer rear bearings and was checking around the rear end yesterday and noticed I have some noticeable play on my drivers axle that does not exist on the passenger side. This is not in/out play, but up and down and side to side. Is there supposed to be a very tight tolerance her? And what what be happening if this play was excessive? Thanks!
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