How to create a VPN between Azure and AWS using only managed solutions

Hello,

Bottom line up front: Need assistance moving DB from AWS to Azure

Thanks for the article above. I am working on a project in which we are trying to transfer several existing PostgreSQL DB from AWS to Azure. We have followed all directions that we can find online to use the Azure DMS but we cannot establish a successful connection between the DMS and AWS. The problem occurs on the 'Select Source' page of the Azure DMS. During the validation step I get an error stating 'Failed to connect'. I have been working on this for a few weeks trying different solutions. I get a different error if I purposely enter incorrect source info, so I believe that Azure is talking to AWS, but not creating the required connection.

I followed all of the steps in the above article and can see that both AWS tunnels are up and the connection in Azure shows connected. However, I still can't get a connection to allow transfer of the DBs from AWS to Azure. Can anyone help?