I have the same problem, now on 2 websites using JetPack. Both websites use the same website host server.
The “xmlrpc” file is working properly according to the browser test.
Logging into the WordPress account to manage the site from that end, it fails to show the websites and asks to create a WordPress site.
I deactivated the security on both sites and that made no difference.
Once I deactivate or uninstall JetPack, then reactivate/install again, I cannot access the Custom CSS, it is not listed in the WordPress Admin side menu.
Also a quirk, the Custom CSS is not working if I change anything in the Custom CSS window, yet the site still uses the Custom CSS to show the changes. This says I cannot use Custom CSS to make any new changes, it won’t work and won’t show changes in the Customizer.
Test in Another Site
I tested the JetPack connection on a different website, different website host and all is working fine, especially at when in the WordPress account for that site.
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This reply was modified 7 years, 5 months ago by mwarbinek. Reason: more info
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This reply was modified 7 years, 5 months ago by mwarbinek. Reason: More Info
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This reply was modified 7 years, 5 months ago by mwarbinek.
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This reply was modified 7 years, 5 months ago by mwarbinek.