- Plesk Onyx for Linux
- Let’s encrypt certificate installation fails when the domain has been recently created.
- Apache restart interval is configured as 10-15 minutes in Plesk > Tools & Settings > Apache Web Server > Apache restart interval.
- The Let’s encrypt certificate can be installed after Apache is restarted.
This is Plesk bug with ID #EXTLETSENC-504 that is planned to be fixed in future Plesk updates.
As a workaround apply option Keep websites secured with free SSL Certificate for the domain's service plan in Plesk > Service Plans > example_plan > Additional Services > Let's Encrypt.