prplemk2 I wouldn't reinstall PHP - if it weren't working, osTicket wouldn't either. Admin -> Dashboard -> Information will tell you what version is in use if in doubt.
From the information in this post, it looks like the issue is not with cron - if the same happens when you run it manually, then the problem is elsewhere. The screenshot you've shown looks okay - have you checked the settings Kevin mentioned earlier in Admin -> Emails -> Settings, and obviously the relevant authentication details for the mailbox in Admin -> Emails -> Emails?
My German 🇩🇪 is very rusty, so I won't try to guess what those menu options are translated to on your system 😇