hi i just sculpted a model and baked displacement maps without an issue, however baking emission comes back completely blank? i have tried in 4.0 as well as 3.6 with the same results in both, anyone able to help please? 
I remember Martin saying needing a BSDF was no longer necessary going into the material output, but maybe you need to have that color ramp plugged into an Emission BSDF or the Principled with emission turned on? Maybe having the emission used under the hood doesn't work for baking.
We don't know, Omar...but Norb ccoolermint got it working as well now...just by re-trying...
