Copilot won't edit text in existing oneNote Page

Hey All, 

I have tried the following in both the OneNote desktop app and the OneNote O365 web app. Both fail in the way described below. 

I have a oneNote page that I use for time tracking on projects. I asked oneNote to edit all listings of the date in one section  to 2026-05-05. Copilot states that it is starting, but then quickly transitions to a blank white box. The copilot box remains completely empty. It is unresponsive for 10 minutes. Eventually, I can click the copilot button in the menu bar and close copilot -- if I try do this right away, nothing happens. 

Please let me know if there is some setting or something that I need to enable, so that copilot can edit oneNote