That’s correct, if you did need to contact support in the meantime, you can email help@monzo.com.
This feature is still being designed.
That tab will be renamed as Accounts when the full current account app is rolled out. We have a very basic version of the UI during the preview & lots more is ready to be added.
You’ll need to contact the merchant, to ask them to transfer you until the CASS is available.
Please report this issue via the in-app chat.