Samsung Shop App is not working on Galaxy M21 2021 Edition. I even clear cache and data thrice, also uninstall and reinstall the app twice but still not working.

I'm unable to connect to 5GHz WiFi Network on my mobile phone and only 2.4GHz WiFi Network is visible and able to connect. But on Samsung Store it is showing that Galaxy M21 2021 Edition (6GB) is Wi-Fi 802.11 a/b/g/n/ac, Dual-Band (2.4+5GHz), Wi-Fi D...