Change the script reported here [1], at point 6 in "Configuring the Image Registry Operator to use Noobaa storage with Red Hat OpenShift Data Foundation" from:
~~~
oc extract secret/router-certs-default  -n openshift-ingress  --confirm
~~~
to:
~~~
oc extract secret/$(oc get ingresscontroller -n openshift-ingress-operator default -o json | jq '.spec.defaultCertificate.name // "router-certs-default"' -r) -n openshift-ingress --confirm
~~~

as if the OpenShift user set-up its own certificates for *.apps endpoints this certificate is needed rather then the default one.

    4.16 (the same replacement is needed for versions < 4.16)