It's on Ledger Live, I only used Electrum as a tool for signing because as you say, you can't sign with Ledger Live.
what if I copied the address from Ledger Live instead of Electrum I wonder?
Is there possibly another method of proof of ownership of the wallet and address? I wonder if a physical printout from the receiving address in Ledger live and a signature would work?
Ok, so it's in your ledger live.
Do you have any funds in your Electrum(Your current wallet)?
If you don't have funds in your Electrum you can proceed to recreate your wallet again with your ledger nano but this time set it to a different derivation path.
Choose p2sh-segwit - m/49'/0'/0' and then let see if you can find the address there
This is another alternative just to find the exact derivation path of the address from your ledger live I don't know if this one will work but just try this.
If you already made some transaction on this address or if the address that you want to make a signed message has current funds this method might be work.
Here's the method
- Open the Electrum again
- Go to wallet then information
- Copy the master public key
- And then paste it here
https://blockpath.com/wallets/local/101?action=appxpubThat tool will scan all possible derivation paths and find any used addresses if the tools find the exact derivation path set up your Electrum wallet again and use the derivation path that you scan from that tool and let's hope that you can find the address that you want to sign message.