iOS 14: Wi-Fi Not Working

Last night I updated my iPhone 6S to IOS 14. After updating, it does not give internet access when connected to the wifi network I normally use. My other device IOS 13 has internet access when I connect to the same wifi network. I updated my settings in the modem interface as in the link below. https://support.apple.com/en-us/HT202068. At the same time, I did not apply all transactions on the link https://www.iphonehacks.com/2020/09/fix-ios-14-wifi-not-working-slow-dropping-out-issues.html I reset my phone's network settings, installed IOS 14 from scratch via iTunes software, but the problem still persists. This issue happened after IOS 14 update. I demand an urgent resolution.