sometimes it is necessary to delete the authentication token that is stored in your jupyter notebook environment, so that the authentication process is re-initiated when you rerun a notebook.
The file location of the authentication token in the open.cloud jupyter environment is here:
~/.local/share/openeo-python-client/refresh-tokens.json
Alternatively you can delete the token with within a python notebook:
from openeo.rest.auth.config import RefreshTokenStore
RefreshTokenStore().remove()
More info on this type of issues can be found here:
https://open-eo.github.io/openeo-python-client/auth.html#troubleshooting-tips