Take a look how I've configured it, hope it will help:
Configure Caps Lock as Hyper Key:
Usage of Caps Lock as Hyper Key:
Note that you need to press all 4 modifier keys + the next key (e.g. - 1) when recording a shortcut and not simply press Caps Lock (if I understand you are doing exactly this, right?).
Check the docs as well:
https://docs.folivora.ai/docs/1004_hyper_key.html