I am using the Microsoft Graph API and am successfully querying a user's meetings and emails. A user (testing the application) reported a JavaScript-error during the authentication process with Office 365 (using ADAL), see Screenshot below.
A few months ago I noticed these pop-ups too, but they were gone after I've updated the ADAL Nuget-Package. I just checked and there is no update available (current version: 4.0.209160138-alpha).
I myself cannot reproduce the issue. It might be that using different O365 tenants cause this issue in some cases (as they load different login-screens), or something else.
Did somebody experience similar errors, knows why/when this happens and a fix for it?