msc4190 not supported?

[lcasale]

Following the instructions here to get rid of all the verification errors when encryption is enabled, however it does not seem to work.

If I don't add the --no-update flag, encryption.msc4190: true gets stripped out (implying it's not a valid flag) and when I do run with --no-update I get the following error...

FTL Error initializing end-to-bridge encryption error="failed to log in as bridge bot: failed to POST /_matrix/client/v3/login: IO.ELEMENT.MSC4190.M_APPSERVICE_LOGIN_UNSUPPORTED (HTTP 400): This appservice has MSC4190 enabled, so appservice login cannot be used."

snippet from my config.yaml..

    # End-to-bridge encryption support options.
    # See https://docs.mau.fi/bridges/general/end-to-bridge-encryption.html
    encryption:
        # Allow encryption, work in group chat rooms with e2ee enabled
        allow: true
        # Default to encryption, force-enable encryption in all portals the bridge creates
        # This will cause the bridge bot to be in private chats for the encryption to work properly.
        default: true
        msc4190: true
        # Whether or not to use MSC2409/MSC3202 instead of /sync long polling for receiving encryption-related data.
        appservice: false
        # Require encryption, drop any unencrypted messages.
        require: false