How to reconstruct key with mnemonic phrases

Hey everyone.
I am an engineer from Japan.
Thanks for all the great advice!

I want to use mnemonic phrases to composite private keys.
I got the mnemonic phrase by Generate Backup (Mnemonic) after the first login.
After logging out, I enter the mnemonic phrase in the form and press Get Recovery Share using Mnemonic, but I cannot compound the private key. Why is this?

The code is [this sample](https://github.com/Web3Auth/web3auth-core-kit-examples/blob/main/tkey-web/intrinsic-flow-examples/tkey-popup-flow- example/src/App.tsx).