Yoroi isn’t really a good option anymore for WMTx staking because it hasn’t been updated in a while. Most people are moving over to wallets like Eternl, Lace, Nami, or Typhon. They all work well with the new setup and are supported going forward.
If you’re switching from Yoroi, just send your WMTx to your new wallet, then connect it to the Vault and go through the verification step. You’ll need to send a small amount of ADA to yourself to link the wallet, and then you’re ready for the next snapshot.
Let me know if you want help moving over. It’s a pretty quick process!