Hi @newtmex, it should work with localhost. Can you check the transaction that is being sent to the maiar defi extension?

It's a delegate transaction. I am trying to create a complete isolated dev environment, so I got to the stage where I am testing the Delegation Dashboard with an SP on my Local Testnet. Sending the 'delegate' tx with the Maiar app works, but I get this issue with the DeFi wallet.

Normally, it works with localhost on any of the public networks (mainnet, devnet and testnet), but I am doing this on a sandbox network (my local testnet)