Wifi issues

Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also Flight ✈️ mode on n off one time, restart your's device without any Sim in slots, interchange Sim in slots, turn off power saving mode then reset wifi and Bluetooth settings too then go to wifi settings and click on intelligent wifi then try to it's again. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.

Your's most welcome to here.

Dear Samsung member,

Greetings from Samsung customer support.

As per your query, please follow the easy troubleshooting steps which might help to solve the issue.

Note: Any prompt that says "Authentication Error" is related to an incorrect password. Please contact your Internet Service Provider for assistance regarding changing your Wi-Fi network password.

1: Settings >> Connections >> Wi-Fi >> W-Fi network >> Tap and hold the Wi-Fi network that you're having trouble with until the menu allows you to select Forget Network.

2: Reset Network Settings:
Resetting the network settings will clear out anything potentially interfering with the network connectivity. This will reset all network settings, including those for:
Wi-Fi information.
Mobile data information (which will be read from your SIM card and re-saved to the device automatically).
Bluetooth connections.
How to reset network settings: Setting >> General Management >> Reset >> Reset Network Setting.

3: Restart the Router and Mobile Device. Switch off your Router (at the wall or with the power button on the router) and wait for 2-3 minutes before switching it on. While you're waiting, press the Power button on your mobile device and select Restart.

Once the router has been successfully connected to the internet again, try to connect to your network on your mobile device.

Make sure there is no interference between the router and your mobile device. Concrete walls, fridges, and microwaves can all interrupt the Wi-Fi signal.

4: Disable flight mode. Find the Airplane/Flight mode option and turn it off.

Update device software (If Software update available): https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-update-software/

Reset the device: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-mobile-how-to-perform-a-factory-reset/

In case the issue still occurs, please visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/

Warm Regards,
Samsung Customer Support.