BTCPay Server with internal CLN (C-lightning, Core) node

I’m struggling to connect my internal CLN node to BTCPay Server. When choosing ‘internal’ node in BTCPay, it easily connects to my LND instance, but I want to use CLN / c-lightning. Can someone post what you paste in the custom lightning node config to make it connect? I have tried many variables, none of these work.

type=clightning;server=tcp://umbrel.local:2104/ ----NOPE

type=c-lightning-REST;server=tcp://umbrel.local:27743/ NOPE

type=clightning;server=tcp://umbrel.local:27743/ - NOPE