I unfortunately am still having the issues, I couldn’t understand why after disabling all plugins, changing my theme, etc….
But today I decided to try again to resolve the issue – I did.
What fixes it for me, and not sure why – I reactivated all my plugins – and I made a new page, it does its thing by saving a draft – then the box comes up…
I chose something like /testing/test/test1 – it didn’t work when I hit publish. So I went back into edit the page – deleted the “slug” – changed the permalink – published – and it worked. It saved it as I typed it in – still grayed out though – very odd.
Thanks for all your help Sami, I just wanted to inform you of how it now works for me.