My new iPhone won’t accept my passcode

i am connected to wifi.

i have reset my phone to factory settings as well as the rest of the restarts and resets.

when i input my apple id and password in on the the phone to activate it says incorrect apple id or password but it works everywhere else. when i try to activate with itunes it says that this apple id cannot be used to unlock this phone but i have never used another account with this phone. the phone is not listed in my devices either which seems weird. i did buy this phone second hand but hand no problem activating it when i purchased it.

Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch         

Try a forced restart.

Reset Device.      

If necessary

Hard reset.        

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting.      

Backup - Restore your device from an iCloud or iTunes backup.      

If you are getting a message that your Apple ID can't be used to unlock the phone, you will need to contact the previous owner to have them log out of iCloud or go to https://www.icloud.com/find/ My Phone and erase the device, then remove it from their account. If you can’t do that, the device is useless. Apple won't unlock it.

Turn off Activation Lock - Apple Support.      

Passcode or password?

Passcode - If you forgot the passcode for your iPhone or your device is disabled.      

Mine is password. I reset my phone then went through the procedure to reset my pass code and updated my password. I can log into iTunes and my apple account on all platforms but my phone says the password is wrong. The linked apple ID is the same but says either the ID or password is incorrect but it's the same I use to login elsewhere.

The thing is that the phone says its linked to my apple id. it has my most of it blocked out but it is the the one i last used for this phone. its itunes that says my id wont work for this phone, its quite confusing and annoying. I can contact the people i got the phone off of but when i got it from them it was free and clear and i set it up no problem. until i lost my passcode and had to get apple to recover it, they made me wait a couple weeks then allowed me to proceed, everything went smooth except this.

You may need to contact the previous owners and have them complete the steps in the 2nd part of the article below.

Turn off Activation Lock - Apple Support.