[Evolution] trouble with Office 365 and OAuth2

[Garrett Mitchener <garrett mitchener gmail com>]

Hi, I'm using Fedora 31

evolution-3.34.2-1.fc31.x86_64

evolution-ews-3.34.2-1.fc31.x86_64

My organization uses Office 365 and I've been trying to get evolution working with it. The sysadmin tells me he set everything up according to https://wiki.gnome.org/Apps/Evolution/EWS/OAuth2. He sent me the application ID and tenant ID. He configured it as a "public" application rather than "confidential".

When I try to add my account to evolution, the first few steps go well. I can set up the account using the wizard. Then I get a mini-browser that prompts for my password. Once I enter that, I get another page that asks if I want to be prompted for a password less often, and I've tried clicking various options there. Then I get an error message

{"error":"invalid_client","error_description":"AADSTS7000218: The request body
 must contain the following parameter: 'client_assertion' or 'client_secret'....

Now I don't know what to do. I'm guessing there's something else the sysadmin needs to do, but I don't know what to tell him. What should I do?

Thanks,

-- Garrett Mitchener