Dot Net 8 Compatibility?

I am battling to upgrade a (working) Dot Net 6 Blazor app using Kafka to Dot Net 8. I am using NuGet “Confluent.Kafka v 2.3.0”. I am stuck on “Failed to resolve ‘kafka:9092’: Name or service not known”. Does anyone know whether there are Dot Net 8 issues or extra steps?