Hello, I had the same problem, and although I updated ubuntu via SSH, it didn’t solve it either. What I tried was to change the version of php, I had 8.1 and it went back to 8.0 and the problem could be solved.
I have the following problem
Tu sitio necesita ser público para utilizar Jetpack: site_inaccessible
Detalles del error: The Jetpack server was unable to communicate with your site https://eulisesavila.com [IXR -32300: transport error: http_request_failed SSL certificate problem: unable to get local issuer certificate]
enter the solutions indicated me, tell me that PHP_FCGI_CHILDREN changed to 2; How I can do this?
https://ww.wp.xz.cn/plugins/jetpack/