I would like to know steps to create shared azure container registry in QAS which is shared in QAS and Prod subscriptions to deploy image to appservice in both QAS and Prod.

I am able to push and deploy image in QAS, however due to cross tenants I am unable to get pull image from QAS container in prod.

So idea is to push an image in QAS ACR in CI pipeline and deploy it in both Environments.

Note QAS and PROD are separate subscriptions.