1.4 Question about

slack_notifier

from

from prefect.utilities.notifications

. I've been using this with great success for years on data-pipeline but I'm getting a JWT error when trying to set it up on a new prefect 1.4 flow:

Missing Authorization header in JWT authentication mode

. I have my slack url setup as an

config.toml

secret just like in my working application. Any ideas about why I'm seeing this error?