Provided it is not dropping out in
Blue Iris, follow these steps:
Go into the camera setting for Blue Iris for the PTZ and redo the Find/Inspect as that will bring the Presets in from the camera - they have to be from the camera GUI.
Next go into the camera settings in BI for the PTZ and in Groups create a group for the PTZ - FrontPTZ or something.
The preset is based on what is in the PTZ, so if there is a preset you want the fixed cam to go to and you don't have the PTZ preset for that, then create a new Preset for the area you want and then a IVS rule for it (if it is a Dahua autotrack). Remember the number of that new preset.
Then go to the fixed camera setting and on the motion settings page, under When Triggered, check the trigger camera groups and then select the group name for the PTZ, then go down and check the Move to preset number you just created in the PTZ and then check Move camera groups and select the group and then you have a spotter cam!