Trying to do a return but "Returns & Exchanges" says "Online Return is not eligible at this time."

You'll need to call Dell to arrange a return.  As long as the system was purchased direct from Dell in the US, and for personal (not business) use, it should qualify.   That said, be prepared for a restocking/shipping charge if the item is open and not defective.

@ejn63​ Thank you for the reply. Would you have the telephone number to call?

I can't find a customer service number that ever gets to a person - just endless prompts and then a hang-up.

Thanks,

Mike