Hey @ipa-big1
We had a similar issue in Namespace: mmul-it - #13 by rascasoft and @rascasoft noticed a typo in the HTTP request snippet I sent.
Can you re-try with the following payload:
curl -X 'POST' \
"https://galaxy.ansible.com/api/v1/imports/" \
-H 'Content-Type: application/json' \
-H "Authorization: Token ${AG_TOKEN}" \
--data-raw '{"github_repo": "slm-ansible-role-docker", "github_user": "eclipse_slm", "alternate_clone_url": "https://github.com/eclipse-slm/slm-ansible-role-docker"}'