Please double check whether correct team ID is set up correctly and is valid. A valid team ID should start with a T and only has characters 0-9 and A-Z. You may follow these steps to find the team ID for your Slack
Open any web browser and log in to your Slack account
Go to your workspace main page and check the URL in the search bar at the top.
The URL looks like this: https://app.slack.com/client/T... The following numbers represent your team ID.