I've noticed a few others having the same issue, but many of them do not have any follow up after they are asked for additional information. I have been using the web app for years. I have changed nothing in my settings or configuration that I am aware of. I was using the app on Chrome and then started getting the 403 Forbidden error. I switched to a different Chrome user and it was working for awhile. Then I started getting the error. I switched to Firefox and the same thing happened. I switched to Edge and again, the same thing happened. It seems to work for about a day before getting the error. I have tried clearing Browsing History, Cookies and Saved Website Data, Cached Data and Files, Media Licenses, Pop-up Exceptions, Location Permissions, Full Screen Permissions, and Notifications Permissions, but none of that helped.
I need this to work. I can't install the Windows app on my work computer and using my phone at work is not a workable option. Is there anything I can do to make it work, even temporarily?