ArgoCD Image updater not considering latest image push to docker hub

[Sir-gits-a-lot]

I have an application with the fllowing 3 annotations:-
argocd-image-updater.argoproj.io/image-list: {dockerhub-username}/{epository-name}
argocd-image-updater.argoproj.io/write-back-method: git:secret:argocd/{secret-name-for-manifest-repo}
argocd-image-updater.argoproj.io/git-branch: main

When I push new image to dockerhub, argocd image updater on next cycle tries to pull image but throws this error:-

Could not get tags from registry: errors:\ndenied: requested access to the resource is denied\nunauthorized: authentication required\n

I cannot get my brains around it. If anybody knows what could be the possible issue, please let me know. Thanks.