Connection failure to an Azure VM PostgreSQL database on shinyapps.io

I am trying to connect a shinyapp hosted on shinyapps.io to an Azure VM that hosts a PostgreSQL instance. When connecting to this PostgreSQL instance locally access is restricted via a VPN.

To bypass that we whitelisted the shinyapps.io IP addresses (shinyapps.io Documentation - Applications):

However, when trying to connect from shinyapps.io, the database connection does not materialize and the connection times out.

Are there any reasons why this might be occurring?

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