Improve logging

apps/api/src/guards/oauth-callback.guard.ts

@@ -5,11 +5,19 @@ export function OAuthCallbackGuard(strategy: string): Type<IAuthGuard> {
   class OAuthCallbackGuardMixin extends AuthGuard(strategy) {
     private readonly logger = new Logger(OAuthCallbackGuard.name);
 
-    public override handleRequest(error: Error, user: any) {
+    public override handleRequest(
+      error: Error | null,
+      user: any,
+      info?: { message?: string }
+    ) {
       if (error) {
         this.logger.error(
           `Authentication with the ${strategy} strategy has failed: ${error.message}`
         );
+      } else if (!user && info?.message) {
+        this.logger.warn(
+          `Authentication with the ${strategy} strategy was rejected: ${info.message}`
+        );
       }
 
       // Do not throw, the callback handler redirects to the login page instead