ESP32-S3 custom board not storing the WiFi credentials

[Sireesha]

Hi,
I am using ESP32-S3 custom board with the Arduino IDE.
In my project, I am storing the Wi-Fi credentials in the ESP32-S3 custom board but after restarting the board, it is not giving the stored credentials.
I checked same with ESP32-S3 development board and it stores the given credentials after restarting the board.
Can you suggest the solution for this? What causes this to happen? What do I have to change in the hardware/software to make this work?
I am using the WiFiManager library to give the WiFi credentials to the board.

Thanks