Cron doesn’t work

Hello,

I can’t get my cron to work properly. I set all the options according to your guide: https://thimpress.com/schedule-auto-posting-pipes-cron-job/

The cron runs on my server:

Location: https://example.com/?pipes=cron&task=callaio [following]
converted 'https://example.com/?pipes=cron&task=callaio' (ANSI_X3.4-1968) -> 'https://example.com/?pipes=cron&task=callaio' (UTF-8)
--2019-03-24 20:10:00--  https://example.com/?pipes=cron&task=callaio
Connecting to example.com (example.com)|109.212.9.88|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 55 [text/html]
Saving to: '/dev/null'

     0K                                                       100% 72.0M=0s

2019-03-24 20:10:00 (72.0 MB/s) - '/dev/null' saved [55/55]

But the pipe doesn’t seem to run because no new posts are created.

If I access the cron url directly this is what I see in my browser:

?{ogb-res:1}
1553458596: 2019-03-24 20:10:00

Do you have any idea what could cause this problem?

Appreciate your help in advance. Thanks!