Mini Pro, Upstream Keyer - Luma & Key On/Off button behavior

Is it possible to use the Atem Mini Pro Key On/Off button to enable/disable Luma Key on the Upstream Keyer?

The manual seems like that button is supposed to turn on & off the upstream keyer, but for me it always switches it to Chroma key. I want it to stay on Luma Key, but I can't figure it out.

The manual on page 13 says: Press the ‘key’ on or off buttons to switch the upstream keyer on and off air

Any help/guidance is greatly appreciated. Thanks!

I'm also trying to achieve this... looks like it's not possible. Another option would be to "trick" the chroma key into behaving like a luma key by selecting black as the key color and tweaking the settings.

Would someone be able to assist with this?

Yes, same problem here. I had contacted the support (end of June 2020), with response was "I will raise this with the developers". waiting since then with great anticipation

"Luma key by selecting black as the key color" did not work for me.

Very frustrated with the Mini Pro Key On/Off button only selecting Chroma. Any news from developers? Thanks to others for posting.

Bump.

Any movement on this? Seems like a big oversight to not let us assign the key. And seems like something easily remedied.