I'm investigating this issue further. It may be related to your server setup, you can check/fix it per the following instructions.
If possible, please contact your hosting provider and ask them to update the bundle of CA root certificates.
If it helps, the curl website has the latest CA root certificate bundle available for download per hidden link
You can download the .pem and save it where your PHP installation can access it.
Then you just need to edit your php.ini file to tell curl where you saved the .pem file.
It's probably much easier to ask your hosting provider to do that for you 🙂
As DEV team requested, I would need to request temporary access (WP-Admin and FTP) to your site
- preferably to a test site where the problem has been replicated if possible -
in order to be of better help and check if some configurations might need to be changed
Your next answer will be private which means only you and I have access to it.
❌ Please backup your database and website ❌
✙ I would additionally need your permission to de- and re-activate Plugins and the Theme, and to change configurations on the site.
This is also a reason the backup is really important