Getting "unauthorized: authentication required" when pushing a docker image

I set up doctl on my computer, got a token and am able to create and delete a registry. Unfortunately, I get an unauthorized error when trying to push a docker image to said registry.

Here’s what I’ve tried.

$ sudo doctl registries login my-registry
Logging Docker in to registry.digitalocean.com/my-registry
Notice: Login valid for 30 days. Use the --expiry-seconds flag to set a shorter expiration or --never-expire for no expiration.
$ sudo docker push registry.digitalocean.com/my-registry/my-app:latest
The push refers to repository [registry.digitalocean.com/my-registry/my-app]
5d69413d1106: Preparing
d1f408cfe088: Preparing
66462cc862fe: Preparing
unauthorized: authentication required