We could not create your Notebook: Failed to fetch

Hello!

I've followed the complete instructions from scratch to create a channel/pipeline/datastore/dataset and a Jupyter Notebook. However, I cannot achieve that last step. I can see the data in my dataset and I'm pretty sure that the roles are ok with the right permissions. I can create a notebook instance but when creating a new notebook in IoT Analytics referencing my dataset and my notebook instance, I keep having this error: We could not create your Notebook: Failed to fetch. I'm a bit lost since there is no more info... My SageMaker role has the GetDatasetContent inline policy so this should be good.

In the sagemaker log, I can see errors like:
[ W 13:20:14.963 NotebookApp ] 404 GET /api/contents/IoTAnalytics?content=0 (10.0.0.XX) 1.62ms referer=None
[ W 13:20:14.999 NotebookApp ] '_xsrf' argument missing from POST
[ W 13:20:14.999 NotebookApp ] 403 PUT /api/contents/IoTAnalytics (10.0.0.XX) 1.72ms referer=None
[W 13:20:14.963 NotebookApp] 404 GET /api/contents/IoTAnalytics?content=0 (10.0.0.XX) 1.62ms referer=None
[I 13:20:35.717 NotebookApp] 302 GET / (10.0.0.ZZ) 0.67ms

Thanks everyone for the help!

The guide that I am following:
https://docs.aws.amazon.com/en_pv/iotanalytics/latest/userguide/quickstart.html