Can't create Role using Keycloak REST API

I'm trying to add a Role to my realm in Keycloak but it's giving me a bad request response. My steps:

1. Get a token using:

 curl -X POST "http://localhost:8180/auth/realms/master/protocol/openid-connect/token" \                                                                 
 -H 'Content-Type: application/x-www-form-urlencoded' \
 -d 'username=admin&password=admin&grant_type=password&client_id=admin-cli'

2. Get the client ID using:

curl -X GET http://localhost:8180/auth/admin/realms/my-realm/clients?clientId=my-client \
 -H "Authorization: Bearer "$access_token \
 -H 'cache-control: no-cache'

3. Try to add the Role using [documentation][1]:

curl -v http://localhost:8180/auth/admin/realms/my-realm/clients/[ID-from-above]/roles \
 -H "Content-Type: application.json" \
 -H "Authorization: Bearer "$access_token --data '{"name":"test-role"}'

When I issue the last command I get a bad request response. What am I doing wrong? Thank you.

https://www.keycloak.org/docs-api/5.0/rest-api/index.html#_roles_resource