No fluid coming out when bleeding rear brakes

[itsaguything]

Did you follow the instructions in the workshop manual for bleeding the brakes?
Did you notice 3 key statements in the instructions:
1. the engine must be running.
2 the vehicle must be connected to LR diagnostic software.
3 there is a particular order of wheel that must be followed.

 

[Al Pizzica]

I have a concern that when you dropped out the piston you put it back in somehow differently, like without some part or with some valve hole being covered or something. Can you bleed the other side? Is the problem only on the side where the piston fell out? Might try looking up piston reassembly procedures.