CertificateUnknown error when connecting to Heroku Postgres database

asp.net postgresql ssl heroku heroku-postgres

With Npgsql 3.1.5 try to use "Trust Server Certificate=true" in connection string.Example connection string:

Server=[servername];Port=[port];User Id=[username];Password=[password];Database=[databasename];sslmode=Require;Trust Server Certificate=true

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