I am seeing the same exact issue. Oddly, the issue only occurs on FF and Chrome. If I attempt the login in MS Edge, it authenticates properly. I can create a video to demonstrate just like the original post shows if needed.
** I should also note, no caching in place. Just a base install of WP 4.8.1 and Gantry 5 framework with the Helium theme all running in Azure App Service.
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This reply was modified 8 years, 10 months ago by anortiz08.