diff --git a/packages/core/src/model-resolver.ts b/packages/core/src/model-resolver.ts
index 448b18d8b2aa..5ab794c7cc44 100644
--- a/packages/core/src/model-resolver.ts
+++ b/packages/core/src/model-resolver.ts
@@ -198,7 +198,7 @@ const resolveCatalogModel = Effect.fn("ModelResolver.resolveCatalogModel")(funct
   credential?: Credential.Value,
   dependencies?: Dependencies,
 ) {
-  const resolved = prepareRuntimeModel(model, credential)
+  const resolved = prepareRuntimeModel(model)
   const configuration = credential?.type === "key" ? credential.configuration : undefined
   const configured = { ...resolved.settings, ...credential?.metadata, ...configuration }
   if (Provider.isAISDK(resolved.package)) {
@@ -256,15 +256,9 @@ const resolveCatalogModel = Effect.fn("ModelResolver.resolveCatalogModel")(funct
   })
 })
 
-function prepareRuntimeModel(model: RuntimeInfo, credential: Credential.Value | undefined) {
-  if (model.settings?.apiKey !== "" && (credential?.type !== "key" || credential.metadata === undefined)) return model
-  return {
-    ...model,
-    ...(model.settings?.apiKey === "" ? { settings: Struct.omit(model.settings, ["apiKey"]) } : {}),
-    ...(credential?.type === "key" && credential.metadata !== undefined
-      ? { body: Provider.mergeOverlay(model.body, credential.metadata) }
-      : {}),
-  }
+function prepareRuntimeModel(model: RuntimeInfo) {
+  if (model.settings?.apiKey !== "") return model
+  return { ...model, settings: Struct.omit(model.settings, ["apiKey"]) }
 }
 
 function validateProviderVariables(
diff --git a/packages/core/src/plugin/provider/azure.ts b/packages/core/src/plugin/provider/azure.ts
index 40cdeb015161..0045908c0c20 100644
--- a/packages/core/src/plugin/provider/azure.ts
+++ b/packages/core/src/plugin/provider/azure.ts
@@ -482,11 +482,12 @@ function expandResourceName(baseURL: string, resourceName: string) {
     .replaceAll("${AZURE_COGNITIVE_SERVICES_RESOURCE_NAME}", resourceName)
 }
 
-// The Azure CLI method stores the resource as credential metadata, the API key method as its form answer.
+// The Azure CLI method stores the resource as credential metadata, the API key method as its form answer. API keys
+// imported from V1 keep their connect-form answer as metadata.
 function credentialResource(credential: Credential.Value | undefined) {
   const resource =
     credential?.type === "key"
-      ? credential.configuration?.resourceName
+      ? (credential.configuration?.resourceName ?? credential.metadata?.resourceName)
       : credential?.methodID === methodID
         ? credential.metadata?.resourceName
         : undefined
diff --git a/packages/core/test/model-resolver.test.ts b/packages/core/test/model-resolver.test.ts
index c8213d5adca4..aa0e4b5e6cde 100644
--- a/packages/core/test/model-resolver.test.ts
+++ b/packages/core/test/model-resolver.test.ts
@@ -710,7 +710,7 @@ describe("ModelResolver", () => {
 
   it.effect("prefers stored credentials over configured auth", () =>
     Effect.gen(function* () {
-      const credential = Credential.Key.make({ type: "key", key: "stored-secret", metadata: { tenant: "work" } })
+      const credential = Credential.Key.make({ type: "key", key: "stored-secret" })
       const resolved = yield* ModelResolver.fromCatalogModel(
         model(Provider.aisdk("@ai-sdk/openai"), {
           settings: { apiKey: "configured-secret", baseURL: "https://openai.example/v1" },
@@ -728,7 +728,25 @@ describe("ModelResolver", () => {
       })
 
       expect(headers.authorization).toBe("Bearer stored-secret")
-      expect(resolved.route.defaults.http?.body).toEqual({ tenant: "work" })
+    }),
+  )
+
+  it.effect("does not project API key metadata into the request body", () =>
+    Effect.gen(function* () {
+      // V1 auth.json stored connect-form answers as API key metadata, and the legacy import preserves them there.
+      const resolved = yield* ModelResolver.fromCatalogModel(
+        model(Provider.aisdk("@ai-sdk/azure"), {
+          providerID: Provider.ID.azure,
+          modelID: "responses-deployment",
+          settings: { apiVersion: "2025-01-01-preview" },
+          headers: {},
+          body: {},
+        }),
+        Credential.Key.make({ type: "key", key: "secret", metadata: { resourceName: "migrated-resource" } }),
+      )
+
+      expect(resolved.route.endpoint.baseURL).toBe("https://migrated-resource.openai.azure.com/openai/v1")
+      expect(resolved.route.defaults.http?.body).toEqual({})
     }),
   )
 
diff --git a/packages/core/test/plugin/provider-azure.test.ts b/packages/core/test/plugin/provider-azure.test.ts
index 77bc333350ff..82b80250e980 100644
--- a/packages/core/test/plugin/provider-azure.test.ts
+++ b/packages/core/test/plugin/provider-azure.test.ts
@@ -574,9 +574,15 @@ describe("AzurePlugin resource name", () => {
       name: "prefers the connection's resource over configuration, as requests do",
       env: { AZURE_RESOURCE_NAME: "from-env" },
       settings: { resourceName: "from-config" },
-      connection: true,
+      credential: keyCredential(),
       expected: "test-resource",
     },
+    {
+      name: "reads the resource of an API key imported from V1",
+      env: { AZURE_RESOURCE_NAME: "from-env" },
+      credential: Credential.Key.make({ type: "key", key: "secret", metadata: { resourceName: "imported-resource" } }),
+      expected: "imported-resource",
+    },
   ]
 
   cases.forEach((item) =>
@@ -586,7 +592,7 @@ describe("AzurePlugin resource name", () => {
         yield* seedProvider(item.settings)
         const providers = yield* Provider.Service
         yield* providers.transform((editor) => editor.update(Provider.ID.openai, () => {}))
-        if (item.connection) yield* connect(keyCredential())
+        if (item.credential) yield* connect(item.credential)
         yield* addPlugin()
 
         expect(required(yield* providers.get(Provider.ID.azure)).settings?.resourceName).toBe(item.expected)