But when selecting the second option, I get the attached screenshot.
To be clear, we want to push staging to live to get our changes to our production site. Then we, of course, want to continue to add content/improve the website on staging, until we once again push it to live.
Is this not possible? I'm just not understanding the workflow here. As per the screenshot, there will be a warning on our LIVE site, if we access staging??
If you select the second option then you need to use the migration code on the live site (and probably the staging site two) so they can share the account in our servers.
As an alternative, you can use the second option and then delete the staging site.
The last option would be to select the first option (this is a copy of the site) and keep in mind that your staging site will be acting as your main site. It won't make any difference for your client's, but it's important that you know it.
I have set your next answer private. Please share the migration code from the live site that you copied before pushing the staging site to the live site.
I have tried from several different countries using a vpn service, and the website is accessible. Can you try from your phone or at least without your current wifi?