Pdf report not sent to all

Piwik is hosted on 1and1… I’m using it to track arround 14 websites …

I set an automatic monthly report by email to all website owners (and a copy to me) but just 3 of them are sent ???

I have controlled setting , all are same …

Somebody have an idea ?

Best regards to all

Do you cron tab archiving: How to Set up Auto-Archiving of Your Reports - Analytics Platform - Matomo

excuse me but Cron ???
No …
Is it not enought to set into the pdf report ?