How to enable Acct-Interim-Interval?

[Houman]

I'm not quite sure how to enable Acct-Interim-Interval in free radius.

/etc/freeradius/sites-enabled/default

post-auth {
        update reply {
                Acct-Interim-Interval = 60
        }

I still can't see the accounting data (Octlets) to be updated after 60
seconds.
Only after I disconnect the connection, I can see them updated.

Before my NAS is accused of not supporting it, I can see it does:

https://wiki.strongswan.org/projects/strongswan/wiki/Strongswanconf

Interval in seconds for interim RADIUS accounting updates, if not specified
> by the RADIUS server in the Access-Accept message.


What am I missing, please?