Last night after I updated the Android 11 on my Samsung Galaxy S10, I noticed that the phone could not connect any longer the Wi-Fi.
Today, in the morning I have looked for a resolution and I found out the solution of the problem.
Initially, you should set up the Wi-Fi and to change some of it’s settings.
At Wi-FI you should hold briefly the selected Wi-Fi and you have a dropdown with several option Manage Network Settings if your phone is in English language, Netzwerkeinstellungen verwalten in German or Menaxho cilësimet e rrjetit in Albanian.
Then you click Advanced, Fortgeschrittene, Avancuar
At the end there is the part of MAC Address. Initially in the Android it was so that the MAC address was generated automatically with a new MAC address each time you connect to the Wi-Fi. But to resolve this issue of being unable to connect to Wi-Fi using Android 11 you should select Phone MAC Address, Telefon MAC-Adresse, Adresa e telefonit MAC,