Hello Bryan
Thank you so much for your response.
Initially, you were unable to view the Azure database for PostgreSQL single server in the azure portal. But you were able to access it from your application.
As informed, we did ARM cache refresh from the backend and now you are able to see the Server in the portal.
As a post-migration step, the automatic Resource Manager Sync is performed, but it occasionally times out and disappears from the portal. However, it will still be functional in your app services.
Hope this helps. Do let us know if you any further queries.
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