Use slack as Identity provider in Aws cognito pool

I want to use Slack as an Identity provider in the cognito pool for authenticating users in my application. I am trying with OIDC provider type but I am getting this error. https://repost.aws/questions/QURPfjsVRNT8GkkbLeCqJ6dw/aws-cognito-not-working-for-google-sign-in-says-the-value-of-attribute-is-an-empty-list-which-is-not-allowed

There is no documentation on using Slack with cognito. Can someone guide me on how to make this work?

Slack Side documentation followed: https://api.slack.com/authentication/sign-in-with-slack#discover