Is it because BW does not have a managed Lightning node, so you need to find a managed node wallet in order to transfer money from BW's on-chain BTC wallet to the Lightning wallet?
Discussion
Correct. They stopped offering that service earlier this year because it was unreliable and they didn’t want to be in the custodial wallet business.
You should try nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5 as a replacement. In a very short time they should have the new version out with an embedded node that lets you create your own channels and swap from on-chain to Lightning.

