Allow me to reply to myself.
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uninstall plotly from both anaconda and python:
conda uninstall plotly
pip uninstall plotly
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install the latest version of plotly (v5.5.0) in the currently active anaconda environment:
(pytorch3d) C:\Users\USERNAME> conda install -c plotly plotly=5.5.0
(pytorch3d) C:\Users\USERNAME> conda list plotly
# packages in environment at C:\Users\USERNAME\.conda\envs\pytorch3d:
#
# Name Version Build Channel
plotly 5.5.0 py_0 plotly