Tags listed on Docker Hub not accessible via docker pull

I’m trying to pull in a php image - php:7.1.23-fpm. According to docker hub, that tag exists:

However, I can’t pull the image:

npastor $ docker pull library/php:7.1.23-fpm
Error response from daemon: manifest for php:7.1.23-fpm not found

I would expect that tags listed on Docker Hub are accessible via docker pull.

Running the CLI tool on MacOS 10.13.6
Docker Version 18.06.1-ce-mac73