Hi David Boyd •,
Welcome to Micrsoft Q&A forum.
As I understand, you are unable to connect to Azure PostgresDB from PowerBI with error "Unable to create an encrypted connection"
Please check below points:
Check your driver in PowerBI, SSL mode, Firewall and IP configuration in DB, check TLS.
If these look fine, then I would request you post your query in the Power BI forum
This will assist you with a faster reply to your query.
Hope this will help.
Thanks