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. If not resolves then reset factory data with backup then try to it's again. Thanks.
As per your query, kindly perform the following steps to resolve your issue.
Forget the Network: Settings > Connections > Wi-Fi > Wi-Fi network > Tap and hold the Wi-Fi network that you're having trouble with until the menu allows you to select Forget Network.
Restart the Router and Mobile Device.
Reset settings: Settings > General Management > Reset. Reset network settings: Reset Wi-Fi, Bluetooth, and other network settings to their default.
If the issue persists kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
