Dashboard Deployment Issue

Issues like this with deployment pipelines are pretty common.  In general, I think the deployment pipelines are more trouble than they are worth.

With that said, start by checking if the data source has a string mismatch.  The semantic model settings section only lists gateways/connections that have matching data source definitions for every source used in the model. The server and database name need to match exactly between what's defined in the connection and what's embedded in the semantic model.

When you deployed Dev to QA, the semantic model still carries the Dev datasource string baked into it. If your QA connection was built pointing at a different server/database name or path, Power BI won't match them.

The deployment process replicates the metadata of reports and semantic models, but the structure is replicated, but connections are not automatically re-bound. You need to manually map the QA semantic model to the correct connection after each deployment.