So we've had at least three instances of holographic tech being a major problem.They didn’t notice anything strange in Patars communication, only when Burnham found the long dead Patar did they dug further.
1) The Enterprise systems crash
2) Spock being implicated of murder
3) Actual Holographic Communications being used for misleading information.
I wonder at this point what it was about the Enterprises systems that caused it to reject the holographic interface?