I do my keyboard configuration with Vial, which may or may not be relevant.

I am unable to momentarily switch layers from a particular layer, and I’m looking for tips.

I have a base Dvorak layer, with all of my layer switches as tap-dance keys under my left hand, with holds triggering a momentary layer switch and all of the other keys under my right hand: a layer for punctuation, a layer for numbers, a layer for function keys, for WM navigation, for tmux navigation… 9 layers in total. It all works well.

Recently, I started playing Factorio again, so I set up a combo switch to the 9th layer, which is bog-standard QWERTY, it being easier to just learn new muscle memory than to reconfigure all 9,000 Factorio key bindings for Dvorak. But now entering numbers was a PITA because my keyboard has no number keys, so I have to switch back to the base layer to use the MO binding to switch to my number layer.

Eventually, I decided this was too much trouble, so I created a tap-dance MO binding for the same physical key in the QWERTY layer… but it doesn’t work, in that the layer is not switched to the number layer - except for “0”: that combination works. The fact that one key works makes me think it is actually sorta switching layers? But all of the other keys just enter the un-switched QWERTY keys.

I’ve tried setting the trigger key to a different one, with identical results. All of the keys on the left hand (and under the trigger key) are KC_TRNS on the number layer, so in both cases I’ve tried the trigger key is KC_TRNS on the number layer. I have not yet tried duplicating the number layer and using that instead.

Does the target layer (the number layer) have to be a layer number greater than the starting layer? Number layer is layer 4, and QWERTY is 9 - do I need to move 4 to 10? Is there some other, common, issue I’m encountering?