Docker - Webgateway

I am trying to pull down the webgateway from containers.intersystems.com and I am receiving the following errors... Please advise

[roth16@int-lxiris-vd02 tls-ssl-webgateway]$ docker pull containers.intersystems.com/intersystems/webgateway:2021.1.0.215.0
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
Trying to pull containers.intersystems.com/intersystems/webgateway:2021.1.0.215.0...
Error: initializing source docker://containers.intersystems.com/intersystems/webgateway:2021.1.0.215.0: reading manifest 2021.1.0.215.0 in containers.intersystems.com/intersystems/webgateway: manifest unknown: The named manifest is not known to the registry.

I tried removing ":2021.1.0.215.0" to see if it was just an issue with the version.