Copy/pasting my username and password into the Docker Hub website works fine.
The password is long, but does not contain shell-breaking symbols.
Copy/pasting those same credentials into command-line docker login results in an incorrect username or password error. I have tried passing the credentials interactively (both copy/pasting and typing) and through command line args, same result:
# INTERACTIVE
$ docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: my@email.com
Password: <REDACTED>
Error response from daemon: Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password
# COMMAND LINE
$ docker login -u my@email.com -p <REDACTED>
Error response from daemon: Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password
@mustaccio was correct.
The Docker Hub website allows you to login with either your username OR your email, and the website does not require a case-correct username.
docker login DOES require a case-correct username, and DOES NOT work with your email address.
When I signed up I chose a camel-cased username e.g.:
MyUsername
Docker forces this username to all lower case in practice. When you log in, you'll see your correct username in the upper right-hand corner of the website. In this example:
myusername
The website allows you to login with MyUsername or myusername.
docker login only allows myusername.