Zcash transactions are currently not going through. Our engineering team has found the underlying issue and the team is actively working on the fix. We will give you an update once Zcash is up and running.
You can view the wallet balance, list the transactions and make usual queries on the Zcash wallet, but you will not be able to initiate Zcash transactions at this time. Please feel free to reach out to BitGo Support if you have any other questions.