Jetpack was unable to communicate with your site

Hi, my site wasn’t working properly on mobile so I began to check if it was caused by a plugin. After deactivating the Jetpack plugin, on re-activation, the following error appeared.

Error Details: The Jetpack server was unable to communicate with your site https://www.healthytreefrog.com [HTTP 404]. Ask your web host if they allow connections from WordPress.com. If you need further assistance, contact Jetpack Support: https://jetpack.com/support/

Does anyone know what this is and how to correct, thank you
I have searched the forum and cannot find this particular error mentioned.