TuxCare Extended Lifecycle Support for PHP can't be enabled in Plesk: CLN response (HTTP 400): You can not register a new server! Right now you have 1 server and your license limit is 1.

Symptoms

• Attempt to enable TuxCare Extended Lifecycle Support for PHP extension result in errors like below:

CLN response (HTTP 400): You can not register a new server! Right now you have 1 server and your license limit is 1.

• Attempts to enable via CLI result in similar errors:

# plesk ext tuxcare-els --enable
Execution installer has failed with exit code 1, stdout: Got incorrect status from CLN: HTTP/1.1 400 Bad Request
...
{"message":"Smth went wrong","details":"(#_#) You can not register a new server! Right now you have 1 servers and your license limit is 1."}
...
ERROR: Failed to configure TuxCare ELS repositories
exit status 3

Cause

Issue triggers on CloudLinux side and currently under investigation.

Resolution

Create a ticket for technical support.