Now, one of our support developers can temporarily login to your site and resolve this issue.
Please send firstname.lastname@example.org a contributor invitation to your site, with administrator access - so we can access your site's code.
(In your site menu, go to Settings > Permissions).
Administrator permission will not allow us to access your Squarespace account or billing info.
We login to hundreds of Squarespace sites each week. We'll email you as soon as the issue is resolved and immediately remove contributor access.