Manifest for scr.sitecore.com/platform/sitecore-xp0-mssql:10.0.0-ltsc2019 not found

Hello,
docker-compose Script was working just fine last night. Today I get the following message
Manifest for Azure Container Registry | Microsoft Azure not found

Within docker-compose.yml
image: ${SITECORE_DOCKER_REGISTRY}sitecore-xp0-mssql:${SITECORE_VERSION}

Looking through https://raw.githubusercontent.com/Sitecore/docker-images/master/tags/sitecore-tags.json it would appear that tag is valid.

Any clues as to why?