"This reservation is not eligible to be upgraded"
 

For a M-fare ticket :confused:

Need more info.

Uh, details?

Sure :)

SFO-FRA-SFO, bought a M-fare ticket on ua.com ... but when I try to request an upgrade, get the not eligible message.

I had this happen to me this past week. I had already requested a PP upgrade on an itinerary last week. For grins, I wanted to know what United was charging for a ToD upgrade. But when I selected this option in my reservation from the app, I was told:

"This reservation is not eligible to be upgraded"

I presume that this was because I had already submitted an upgrade request ... which may or may not be relevant to the OP. ;)

They just want to save you the agony of dying on the waitlist. :p

I would call CS and ask them as an M fare should be eligible for an upgrade. Also, take screen shots before they start playing with the reservation. Good luck!

Upgrade with what?

Can happen if there is an existing upgrade request in place or you have been upgraded.

Other conditions, a bulk fare purchase? But those are not available on ua.com.
There are other non-published fares that have restrictions.

Or a simple IT glitch, a call to UA will probably provide more information.

I never got the "what" option, the ineligible message popped up on clicking Upgrade.

Called 1K desk, they weren't sure what was happening either ... so they decided to cancel and rebook and now I'm on the upgrade waitlist ^

I had this happen to me on a IAH>LHR flight booked into T on Saturday when I saw PZ space was open. I closed the browser and tried again and it worked fine and offered the MUA upgrade. Perhaps just an IT issue?

Maybe the PNR was not fully ticketed when you tried to upgrade and getting the error message.

Had the same message pop up for me on ERJ-145 and CRJ-200 planes. But flying one of those SFO-FRA would be quite the feat...

You are flying UA, not LH, correct?

Yes, UA.

Reissuing the ticket fixed it.