Only refresh when server responds with 401.

src/token-pool.js

@@ -83,7 +83,7 @@ class TokenPool {
       });
       console.warn(`Adding ${res.length} tokens to acquired pool`);
       this.tokens.push(...res);
-    } else {
+    } else if (response.status === 401){
       // refresh the access token. This will call generateTokens if the refresh is successful
       AccessToken.refresh();
     }