And sorry Alexey, I do not receive notifications. I looked in sys_cron_jobs, I do not see anything about the messenger, is this normal?

So if I understand correctly, if memberx1 speaks to me 10 x and memberx2 speaks to me 20 times in two separate conversations, I must receive 10 notifications in the space of 1 hour (setting on 5). no notfications ... zero, nothing, nada ...