WordPress URL Issue

On our old site, we had a page
www.domain.com/contact-us/
which doesnt exist anymore.
No we have www.domain.com/contact/

But Google tells, www.domain.com/contact-us/ was the famous page with good domain authority, so we tried to edit the permalink for www.domain.com/contact/ to contact-us , but its saving as contact-us-2

I searched for www.domain.com/contact-us/ on frontend and backend, but it doesnt exist, so why does it not accept contact-us ?
Is there a way to search this on…
WordPress URL Issue

See original post by QubeSys Technologies