Hi Kevin,
You nailed it. I must have made a mistake uploading the .phar to our server. I corrected my mistake. The interface indeed no longer shows that resource owner field, moreover, the whole thing is working perfectly fine now!
Many many thanks for your help and sorry for my stupid mistake causing me to steal your time.
I'm hoping that this will also solve my other issue with the agent alerts, (other thread) which I will tell you about once I know the results of that.
Thanks again and have a great day.
Hans