Oh my God! I have been researching this same topic for over a week now. I have changed my router set up, down load so call fixes and was about to get a new device. But, Hallelujah! I found a fix!

{Please do not edit my answer without my permission unless you know me personally. Otherwise, make your own comment what should not or should be stated. I will edit my own answer.}

Did you know that you can long press the connection? It was just that simple.

1. Go to Settings and tap on Wi-Fi.
2. Turn on the Wi-Fi and connect to a network.
3. Long press on the connected network and select Modify Network.
4. Check Show Advance Options.
5. On IP Settings drop down menu, select Static.
6. Assign IP of your choice but leave other variable untouched.

This may not be a total fix for businesses and educational establishments, because an IP address with need to be assigned. But for personal devices, this is a life saver!!!!!!

For further information on this see: https://appslova.com/how-to-fix-obtaining-ip-address-error-in-android/

Did you know that you can long press the connection? It was just that simple.

1. Go to Settings and tap on Wi-Fi.
2. Turn on the Wi-Fi and connect to a network.
3. Long press on the connected network and select Modify Network.
4. Check Show Advance Options.
5. On IP Settings drop down menu, select Static.
6. Assign IP of your choice but leave other variable untouched.

This may not be a total fix for businesses and educational establishments, because an IP address with need to be assigned. But for personal devices, this is a life saver!

For further information on this see, visit the article How to Fix Failed to Obtaining IP Address Error in Android.