If you are using Huawei, TimeTree may not be able to send you notifications due to restrictions from your device and widgets are unable to be displayed due to the battery saving setting.
Check the settings of your device.
1)Disable Manage automatically for TimeTree
Settings> Battery> Start> App Launch >Turn off Manage automatically by tapping on the switch to the right of TimeTree
In the pop up menu, enable Auto-launch, Secondary launch, and Run in background options
Then, Tap on OK
2)Deactivate the power saving mode
Settings> Battery> Energy Saving Mode> Make sure "Ultra Energy Saving" is off
3)Disable Battery Optimization for TimeTree
Settings> Apps and Notifications> Apps> Settings> Special Access> Ignore battery optimization>Tap on TimeTree and choose Allow, then press OK
1)Deactivate the power Ultra saving mode
Settings> Battery> Power saving mode, check that Ultra power saving is off.
2)Settings> Battery> Other battery settings> Check "Maintain connection status even when terminal sleep"
3)Disable battery optimization
Settings>Apps & Notifications>Apps>Find Settings near the bottom of the screen
> Special Access> Tap on Ignore Battery Optimization> Tap on All Apps> TimeTree> Choose Allow