Just a guess, but beings you didn't give YEAR/MAKE/MODEL, that's all I can do.
IF it's the rear drive chain you're talking about (as opposed to the primary chain), get rear wheel off the ground.
With bike in neutral, rotate rear wheel until you find the tightest spot of the chain in the middle between the rear sprocket and the transmission sprocket.
Loosen axle nut, adjust rear axle adjusters evenly until slack is within spec.
Rotate rear wheel in normal direction of travel and see that chain is tracking true on sprocket. If not,adjust as needed with axle adjusters.
IF mechanical rear brake (instead of hydraulic rear brake), adjust brake.
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