Splunk RUM questions

[kvedurumudi]

1. I am trying to set up Splunk RUM. I updated the global attributes using setGlobalAttributes. I have a user ID set in the global attributes. 
   
   I can see the global attributes in the user sessions table, but I am not able to filter by the user ID.
   
2. I have added
   
   instrumentations: {
       websocket: true,
       socketio: true,
     },
   to track the WebSocket errors, but I don't see the socket errors logged on my dashboard. Where can I find them?
   
   Please help me with the above queries. 
   
   Regards,
   Kalyan
   k.vedurumudi@spglobal.com