Issues with Postman, The JWT string must have two dots

I’m trying to get a post request with postman but, I get the following error message:

https://…/api/v1/category/

{

    „errors“: [

        {

            „code“: „9“,

            „status“: „401“,

            „title“: „The resource owner or authorization server denied the request.“,

            „detail“: „The JWT string must have two dots“

        }

    ]

}

For the authentication I’m using the „Access key ID“ and „Secret access key“ under setting -> integration -> add integration (Shopware 6).

And in Postman I’m adding the ID and Secret key under „Auth“ -> „AWS Signature“ (Postman v7.23.0).

I already saw this post, but it doesnt help. Do I use the right token? If not, where can I find the right token for postman?

In Shopware go to Setting

Integrations -> Add Integration

In Postman the Grant Type is Client Credentials

Access Token URL looks like this https://supertramp.shopwaredemo.store/api/oauth/token

Access key ID is in Postman the Client ID

Secret access key is in Postman the Client Secret