Just had the same "Unable to complete the check-in process" message pop up for a domestic itinerary tomorrow (T-23)
Originally Posted by
USFdonWill
Yes, typically need to verify your passport and/or visa.
Domestic, so shouldn't be an issue
Originally Posted by
Often1
While this is most typically a function of UA's need to verify your documents and thus accomplished quickly, it can also be due to your reservation being out of "synch" a common UA IT fault.
Two agents have confirmed that the reservation is "in synch" so that's not it. They say there's nothing they can do from their end and IT helpdesk was unable to help either.
Not sure what the issue is - it's not like they don't know who I am, this is my 74th segment of the year!
Frustrating as on a trans-con flight, check in time could be key for upgrade priority (something the agents fail to grasp/care about)