This is a great question. We have to test the LNBITS instance as a funding source all the way. I haven't tested that part... But after troubleshooting with you nostr:npub14cgq353exzmhdsvqjtmw4dq7fvyleuls8umyrvd5umhr4gtx6asq7hqjhl earlier, I would agree with everyone above that the funding source config needs specific error logging when we make mistakes in the config (macaroon or address) or when it can't reach out node for whatever reason 

Otherwise, Alby and LND Rest (over clearnet) works like a charm --> we've tested Voltage ⚡!!😋