Quarkus extensions for Azure services are built with Quarkus 3.x, I confirm that 2.x version of Quarkus is not compatible with Quarkus extension for Azure Key Vault. The latest version 1.1.2 of Azure Key Vault extension uses Quarkus 3.19.0, and the oldest version 1.0.3 uses Quarkus 3.10.0, details pls reference compatibility matrix.