First, welcome to OCC.........
You have one of two conditions here.
(A) You have not got enough vacuum to engage to the Actuator
(B) Or, there is something wrong with the Actuator itself (worn, broken, leak, etc)
Update:
To test crankcase vacuum with vacuum/pressure gauge:
1. Remove dipstick or oil fill plug/cap.
2. Install adapter into oil fill/dipstick tube opening, upside down over end of a small diameter dipstick tube, or directly into engine if a tube is not used. Insert barbed gauge fitting into hole in stopper.
3. Run engine and observe gauge reading. Analog tester–needle movement to left of 0 is a vacuum, and movement to right indicates a pressure. Digital tester–depress test button on top of tester. Crankcase vacuum should be a minimum of 4 WC in.
If reading is below specification, or if pressure is present, check table below for possible
causes and conclusions.