The optical module on the RH5885 PCIE has no light after the server is powered on

Under normal circumstances, the optical module should have light after the device is powered on, right? I don’t know if the optical module on the RH5885 expansion PCIE slot has no light after the RH5885 is powered on. It has been verified on site that the optical module of the same model and configuration still has no light. Is there any configuration that needs to be changed?

On site, two 4-way RH5885s are connected to an 8-way system with 1 master node and 1 slave node through stacking cards and QPI cables. However, there is no CPU on the slave node, which is equivalent to just The stacking card is configured and the QPI cable is connected, but there is no stacking function. I don't know if it is because of this?

Thanks