When I try to edit and existing Canvas app or try to make a new one from scratch, I get the error below. It only happens here. I can edit MD-apps.
I looked on the Internet and tried several suggestions a clearing the browser cache, resetting my password (also in Azure AD). I can log on everywhere, but only when the canvas-editor needs the open the error appears.
Anyone any suggestions.
Log out from your O365 account and close all the pages of the brower.
Try to use an incognito version of the browser to see if the problem persists.
Hope it helps !