No servo input on channel 7

New to this so hoping i have done this correctly.
Hoping someone can help.
Trying to setup my heewing t1 vtol pnp, I’m not getting any aileron movement on servo output 7.
I have played around with the settings and I can get them to work on every servo output except 7?

PNP meaning the Heewing flight controller? Perhaps it’s a PWM output Group thing to consider?

The PWM is in 4 groups:

  • PWM 1 and 2 in group1
  • PWM 3 and 4 in group2
  • PWM 5 and 6 in group3
  • PWM 7-9 in group4

Channels within the same group need to use the same output rate.