Cannot connect to BLE GATT Server with a Raspberry Pi 5

Hi, everyone,

I can't connect Bluetooth Low Enegy to BLE GATT server with a Raspberry Pi 5, please see to the attached picture. My phone is Redmi 10 Android 13.

However, sometimes my phone can connect if I restart the phone 2-3 times. Has anyone experienced this problem? Do you have any solutions to solve these problems?

Thank you