yarn server fails trying to pull mongo from Docker

[davewthompson]

Fresh install of Docker.
Fresh install of f8app.

Running yarn server results in:

yarn run v1.6.0
$ docker-compose up
Creating network "f8app_default" with the default driver
Pulling mongo (mongo:)...
ERROR: Get https://registry-1.docker.io/v2/library/mongo/manifests/latest: unauthorized: incorrect username or password
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.