Thank you for your reply. A Dell representative was able to resolve the issue in this forum, I am happy to say.
My Inspiron 7775 was recently replaced with a refurbished PC by the System Exchange team. I had a 4-year protection plan that included in-home service. I still have a year left on that plan, but I can't find any evidence of this. Neither the Service Tag of my old computer nor the Service Tag of the refurbished replacement show any warranty information when I input them into Support Assist or on the Support website. How do I find my warranty information?
No warranty information on refurbished exchange