You can only use lightning to fund your wallet on SN and Coinbase does not support lightning. Coinbase would also not accept a lightning address for withdrawal - so funds shouldn't have left Coinbase. If they did you should reach out to their support team.
If you don't have a lightning wallet, I recommend the mobile Muun wallet. Send your Coinbase bitcoin to Muun and then send from Muun to SN.
Right on, thanks!
Noob here, trying to fund my wallet here via lightning address from a Coinbase wallet. Funds have left coinbase, but I haven't received them here. What am I doing wrong?