Originally Posted by lincolnjkc

Are you a *G or a *S/general member? If you're *G you should have access at any club along the trip, likewise if the Business segment(s) is (are) operated by UA
If you're not a *G and the Business class flight is operated by a *A airline other than UA you have access only at the airport where your business-class flight is departing:

(https://www.united.com/ual/en/us/fly...es/access.html)

I don't believe that this has changed recently, but as a UA *G with a club membership I can't say I've paid close attention. I suspect this has to do with when/where the operating carrier is willing to or required to reimburse UA for the access by their business class passengers.