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Weird, the workflow failed with a binder authorization error:

  File "/opt/hostedtoolcache/Python/3.8.10/x64/lib/python3.8/site-packages/binderbot/binderbot.py", line 111, in start_kernel
    headers = {'Authorization': f'token {self.token}'}
AttributeError: 'BinderUser' object has no attribute 'token'

@yuvipanda - any idea what might be happening here?

I think it could be to do with me running the notebook locally to test it I think cleared all the outputs and checked it in but I fear it has a memory of something not in binder?

No it has nothing to do with your local environment.