Hi Jeffrey,
That looks like it should work, just press down firmly and they should click in (after the cover is retracted and the micro hook is fully out, keep pushing until it clicks).
If that does not fix it, it's possible either your probes or tips are defective, I'd ask that you send them info for repair (both the tip and probe, so they can be checked together):
https://www.tek.com/en/services/select-factory-service-request
Make sure to mention my name in your repair submission so it's directed to me.