Failed to pull image 1.78.0-jammy-production manifest unknown

klml@lux capc/bundesmessenger [0] : ~/develop/bundesmessenger
$ oc get po
NAME                                               READY   STATUS                 RESTARTS   AGE
bundesmessenger-8466f55984-wd6cp                   0/1     ErrImagePull           0          33s
bundesmessenger-confighub-nginx-6f94d66648-v9mwx   0/1     CreateContainerError   0          33s
bundesmessenger-generic-worker-0                   0/1     Init:ErrImagePull      0          33s
bundesmessenger-redis-master-0                     1/1     Running                0          33s
bundesmessenger-signingkey-job-928g5               0/2     ErrImagePull           0          33s
klml@lux capc/bundesmessenger [0] : ~/develop/bundesmessenger
$ oc get events | grep signingkey
51s         Normal    Scheduled           pod/bundesmessenger-signingkey-job-928g5                Successfully assigned bundesmessenger/bundesmessenger-signingkey-job-928g5 to capc-v9tg6-worker-stargate-a20-v1-h7fwt
48s         Normal    AddedInterface      pod/bundesmessenger-signingkey-job-928g5                Add eth0 [10.138.34.74/23] from openshift-sdn
10s         Normal    Pulling             pod/bundesmessenger-signingkey-job-928g5                Pulling image "registry.opencode.de/bwi/bundesmessenger/backend/container-images/synapse:1.78.0-jammy-production"
10s         Warning   Failed              pod/bundesmessenger-signingkey-job-928g5                Failed to pull image "registry.opencode.de/bwi/bundesmessenger/backend/container-images/synapse:1.78.0-jammy-production": rpc error: code = Unknown desc = reading manifest 1.78.0-jammy-production in registry.opencode.de/bwi/bundesmessenger/backend/container-images/synapse: manifest unknown
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