I’m am trying to send Bitcoin through my electrum wallet to my electrum tails wallet and yes they are different wallets not on the same seed.
"TX decode failed" is a Bitcoin Core error message, not an Electrum one. Are you trying to sign a transaction on Electum and broadcast it on Core? Or are you trying to export a partially signed transactions? What version of Electrum are you using? Are you getting some other error message from Electrum?