Can we use 4x4 MIMO per user in mmWave?

I have one doubt for mmWave.
Per user, can we use 4x4 mimo or 2x2 only possible?
As RU for mmWave is 2T2R.

Analog beamforming it supports.
Anyone having idea for mmWave?

I think it is max 2x2 for FR2.

Yes 2x2 currently supported by most UEs for mmWave.

Sub 6 and sub 1 Ghz 4x4 supported by UE.
Even Qualcomm X60 don’t have higher capability…