Hi,
I understand the issue. The leds can be on or off based on your TICS PRO file (I had the similar issue, check RFSoC 4x2 PLL Lock Leds don’t turn on.
Can you tell me whether you changed the registers for DAC in LMK? What is your clock speed for all? Is PLL enabled in block design? Since DAC PLL is working, that might be wrong configuration in either of them.
Best