If you send a Device Notification text to that same device in hubitat that is showing “not present”, does it get to your phone? (Enter some text, then click the “Device Notification” button.)
If it doesn’t, it means that you are not on the right device in Hubitat (IE, the phone app is linked to another device in Hubitat), and hence they wouldn’t be synched.
Thank you for the feedback - I was connected to the correct device, but no notifications were received. The problem was resolved when I deleted and then recreated the mobile device.