I've setup a docker up login on the docker hub website.

I've run sudo docker login and put my credentials in.

When I run

sudo docker pull sequenceiq/hadoop-docker:2.7.1

It downloads 5 hashes and then I get

unauthorized: authentication required

and then the pull finishes.

This person can reproduce this issue.

Note that this is different to two similar questions because they're about docker push and not docker pull.

There is a little bit of chatter here about docker pull authorization issues related to config.json format and the UTC date. I don't see how they're relevant to this situation.

My question is: Why do I get unauthorized: authentication required from a docker pull from docker hub?