wahid on Nostr: I’m trying to create a watch-only wallet for an Casa wallet that uses a mobile key. ...

I’m trying to create a watch-only wallet for an Casa (npub1cas…tzdc) wallet that uses a mobile key. How would I get the public key for mobile key (iPhone)? The article https://support.casa.io/knowledge/creating-a-watch-only-bitcoin-wallet-in-electrum doesn’t explain or is outdated.