After updating my iPhone to iOS 13.5.1, I can't login to my Apple ID - "Verification Failed '' error I had this problem after updating my IOS device iPhone 6 to 13.5.1 - I have not used this phone for about 4 months and I'm trying to get it working.
Internet is fine but my emails and Google service also stopped working.
I wanted to wipe the device but I can't since I have to turn of the 'Find My iPhone' option which I couldn't since I can't pass the Apple ID verification step.
I would set aside the phone that’s not working and get control of your AppleID using a web browser on any convenient and secure computer.

https://appleid.apple.com/account/manage

By design it is difficult to bypass activation lock unless you are the original purchaser of the phone and can provide proof of purchase to Apple Support.

https://support.apple.com/en-us/HT201365