Thank you! The exchange was completed.
After a year of ownership started having problems with intermittent black screens. Contacted Dell. As of Feb 10, 2022, to quote Dell, "Your service request has been processed and replacement part(s) have been ordered.". It's April 13, and no replacement is forthcoming. The last word I heard was a phone call asking if it was ok if support could close the file.  I said it was not okay, but I am assuming they will do whatever they choose to do. Honoring a warranty is obviously not part of what they are choosing to do.
U2720Q, waiting 63 days for exchange