Running tensorboard in sagemaker

I'm unable to view tensorboard in sagemaker notebook instance. Tried 2 methods -

1. Running in a notebook

!pip install tensorboard
%load_ext tensorboard
%tensorboard --logdir runs --host localhost --port 6006

Opening the link - https://<instance-url>/proxy/6006 shows failed to load active dashboards

2. Running in notebook terminal

pip install tensorboard
tensorboard --logdir runs --host localhost --port 6006

Opening the link - https://<instance-url>/proxy/6006 shows blank image