Wifi is fine but ipad won't connect to internet. I have tried EVERYTHING.

My ipad can connect to my wifi but my apps and websites will not load. I have tried resetting network settings multiples times. I tried to download the software update but it failed to update. I also tried to erase all content and settings but it always says "verification failed". I have lots of storage space and I am not connected to a VPN. My wifi works fine on all my other devices. What can I do to fix this?