The ioStation 24c should not conflict with the Apollo Twin mk2. You may use in the following scenarios without complications:
1st Scenario
- ioStation 24c as an audio interface and control surface.
- Apollo as plugin processor
2nd Scenario
- Apollo as an audio interface and plugin processor
- ioStation 24c as a control surface only.
- Need only select Apollo as the interface. The ioStation will still work as a control surface.