Hey, I had the same issue in Colab described on the initial post of this thread. What fixed it for me was to click on the top right where is says RAM. This will open a window where you can see all your active sessions in colab. Close them all and reopen the notebook you want to work in. Re-execute the init lines of code containing pip install -Uqq fastbook and a few other lines. This should ask you to log into your google account. After that everything worked for me.
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