Why does the Xiaomi Smart Band 8 sometimes not receive messages when connected to an iPhone?

1. Please confirm the Bluetooth connection between the mobile phone system and the device. If it is not connected, please select the connection. If it cannot be connected, please ignore the device and enter the app to re pair and bind. At the same time, when the app pops up, select [Allow];
2. If the Bluetooth of the mobile phone system is connected, please tap on the small icon after the connected device to enter the Bluetooth details page of the band, confirm whether the sharing system notification is turned on, and if it is not turned on, please turn it on.