@ShanaMcS could you send a screenshot of where you saw the option to upgrade to Comfort Plus, please? I didn't think SAP Concur Travel had an upgrade option. I know when searching for flights the preferred seating options would show in the results, but I don't ever remember seeing an option to upgrade in Concur Travel once I've selected my flight. That is why I don't think Concur Travel could match the price on Delta's website. I'm also confused as to why it wouldn't just be the same price since the upgrade is from the airline.
Be sure to provide the entire screen. Thank you.