I assume this is Apple’s issue moreso than Kagi’s. If anyone is reading this from the Safari team, setting Kagi as default search is far too difficult and the app workaround is unreliable.

I continue to pay for Kagi despite barely using it (Kagi doesn’t charge you if you don’t search in a given month! Fantastically consumer friendly feature) but this issue makes it useless on my mobile devices where I use search most.