[Podman] help with /etc/subuid needed

Sorry, at the moment I'm blind. Could anyone give me a hint, about my surely obvious mistake. *Problem* rhel8.5 / podman version 3.4.2 the following command fails.

(rootless) podman pull docker.io/library/mariadb:latest ... Error: writing blob: adding layer with blob "sha256:08c01a0ec47e82ebe2bec112f373d160983a6d1e9e66627f66a3322bc403221b": Error processing tar file(exit status 1): potentially insufficient UIDs or GIDs available in user namespace (requested 0:42 for /etc/gshadow): Check /etc/subuid and /etc/subgid: lchown /etc/gshadow: invalid argument

*but*

cat /etc/subuid me:100000:99999 cat /etc/subgid me:100000:99999

The same command runs fine on fedora 35 / podman version 3.4.4 . Regards Uwe