I believe you have a 2020 MY bike, so the diagnostic checks should point you directly at the issue. However IIRC from your other posts across various different threads, problems emerged after a flash & the fitting of Arrow headers, so one has to consider what has been disturbed during these changes. I understand the CC turns on correctly & the light is stable, not flashing, but then refuses to accept the set command.
So, looking at diagnostics, can you refresh us by detailing what the results of the check procedures show: -
Go into diagnostics and toggle (TCS) up to step 20/xx. xx should be OFF, shift to neutral and xx should be ON. Shift back to 1st.
Go to step 80/xx, xx should be OFF, press RES+ and xx should be ON.
Go to step 81/xx, xx should be OFF, press SET- and xx should be ON.
Go to step 82/xx, xx should be OFF, pull the front brake lever and xx should be ON.
Stay on step 82/xx, xx should be OFF, press the rear brake pedal and xx should be ON.
Stay on step 82/xx, xx should be OFF, pull the clutch lever and xx should be ON.
Stay on step 82/xx, xx should be OFF, turn the throttle backwards and xx should be ON.
Go to step 83/xx, xx should be OFF, pull the front brake lever and xx should be ON.
Stay on step 83/xx, xx should be OFF, press the rear brake pedal and xx should be ON.
Step 82 tests the cruise cancel switches, step 83 tests the brake light switches.
Problems with the throttle roll back switch are rare, but it's possible for the cables to be incorrectly adjusted, or even displaced. We have also seen cases where the wires from the switch have been damaged/trapped due to careless service work.
Perhaps you can clarify, so we have the whole story in one place.