@remolueoend , Thanks for posting this question!
From the screenshot, it looks like you're not using the full image URL. Kindly use the full name of the image registry <registry.gitlab.com/<group name>/<image name> and then check if it works fine. Just sharing a related example here.
For the private registry, you must set the registry name before the image name.
Please let me know how it goes, I'll follow-up with you further on this.