Hi Mohamed,
Without digging into the logs, are you using your own (insecure) registry? It's possible that the new App Host no longer supports insecure registries by default. There are two options, either upgrade your registry so that it's secure, or identify your registry with "insecure-registries". Refer to the documentation associated with your registry implementation on how to make that identification.
Hope this helps,
Mark
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Mark Scherfling
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