This used to work just fine until a couple of weeks ago. Now I just get the following error after signing in to Harvest via the popup that appears when clicking the signin button: "Please make sure that third-party cookies are permitted or that harvestapp.com and platform.harvestapp.com appear in your whitelist."
Hey all! I found the issue!
Chrome version 79 (beta channel) is testing a new Cookie format. You can override it by going to chrome://flags in the browser and disabling the SameSite by default cookies option.
It seems that with new versions of Chrome, websites need to specify a SameSite attribute for how to handle cookies. It actually needs to specify SameSite=None in order to enable third-party usage.
It seems that something major is coming in the next version of Chrome OS though:
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