No power going to front actuator

Have you one over all wiring diagrams using the guide? How did it turn out?

Yes that may cause it if it is shorted out internally. Let us know.

The sensor is in the encoder.

I would start over with the wiring diagrams and guide to check the connections.

They don't show the ground locations you must test to see if the ground is working. Use the guide and diagrams to test.

Yes. check out this guide it shows you how to do the testing.

https://www.2carpros.com/articles/how-to-check-wiring

Please run down this guide and report back.

There is only one wire that should have power. The Dark Blue with read stripe should have power all the time. The black wire is a ground wire, It should go up through the harness to a ground point on the chassis. The other two wires are selective ground wires. The system works electronically. When you select 4WD the body control module sends a signal to the transfer case and the front axle disconnect actuator. The transfer case shifts and as it locks into 4XH it sends a signal to the BCM telling it to move the front axle disconnect into lock position. The BCM sends the signals to the axle through the TIPM. The Violet with Dark Blue wire is the control wire, it is switched to ground to control the actuator, The Violet with Dark Green wire is the signal wire which tells the TIPM and BCM that the interlock has locked into 4WD.
The way to tell if there is a problem in the system is easy. Get a simple test light, Connect it to battery positive and check that the black wire is grounded. If it is, the light will come on when you touch the pin in the connector. Now move the test lamp to pin two, shift the transfer case into 4WD. The light should come on as the system shifts into 4WD. Now once it is locked into 4WD move the test lamp to pin 4. The light should now be on as this is a switch inside the actuator. I suspect that the issue is in the wiring between the TIPM and the front actuator, or the actuator itself has failed and isn't switching. To release, the signal is sent to the actuator and inside it reverses the polarity to the motor and move the actuator moves the opposite direction.