Cant pick adjustment layer for track matte

Track Mattes must have pixels. Adjustment layers do not have pixels. You have to turn off the Adjustment Layer switch to use a layer as a track matte. You should only be using Adjustment layers to add effects like a color correction to a bunch of layers. If you need to have one track matte for a bunch of layers, AE 23 can do that. If you are using AE 22 or earlier, the simplest option would be to create a pre-comp from all the layers that need the matte applied and then just use a mask or a simple Track Matte for the Nested comp (pre-comp).