Hello! I was getting this error too and this is what solved it for me:
EDIT: You need to disable Brave protections before doing these steps. You can do it by clicking on the Brave icon on the right corner of your address bar.
- Go to the notion site.
- Press F12 and go to Application
- Click in every item marked with red and delete all (Cookies, Local Storage and Session Storage Data)
- Do a hard refresh in the notion web using CTRL + F5
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Delete Local and Session Storage with this button:
-
Delete Cookies with this button:
Hope this helps!