Cant install

Hi
I am using postgres 15 on ubuntu 22.04 and have just tried to install pg_cron to no avail.
I assume the correct version to install is postgresql-15-cron.
I have added the sharelibraries as follows
shared_preload_libraries = 'pg_cron'
cron.database_name = 'azdb'
cron.timezone = 'AU'
and restarted the postgres server.
I then attempt to install the extension
CREATE EXTENSION pg_cron;
and get this error
ERROR: pg_cron can only be loaded via shared_preload_libraries
HINT: Add pg_cron to the shared_preload_libraries configuration variable in postgresql.conf.

SQL state: XX000

please help urgently.. what am I doing wrong?

thanks

The issue provides no repository file, test, or entry point to investigate. Start by reproducing CREATE EXTENSION pg_cron with the shown PostgreSQL 15 and Ubuntu 22.04 settings, then verify the shared_preload_libraries configuration and restart behavior. Done means identifying the configuration cause or documenting whether the reported setup works.

Written by the indexing model from the issue text.