Sounds about right. The “direct” part being key. I think the framework I was using (Vue 2) was adding some “async” intermediary stuff the way I was using it bet

Sounds about right. The “direct” part being key. I think the framework I was using (Vue 2) was adding some “async” intermediary stuff the way I was using it between the DOM click event and the msal.js window.open call. Once it’s in a callback, it’s not “direct”. I simplified some code, restarted everything (WebPack hot reloading has been quirky too) and it’s working now. Still took an hour or two of my evening in reading a debugging though, and not exactly sure WHY it went from broken to fixed <shrug>