I have user that is accessing a Dashboard in Production Portal from his iPad that has IOS 15.1 beta installed. He is able to access the Dashboard, but the tiles don't seem to be working for him when he selects the date. To troubleshoot, I downloaded IOS 15 on an iPad and I have no issues viewing the Dashboard. Is there a solution to this currently or does ESRI just not supported IOS 15.1, yet? Thank you all!