My partner was "shadow banned" from Uber for what we suspect was a payments related reason. No matter what card she put in Uber, she would see "payment decline

My partner was "shadow banned" from Uber for what we suspect was a payments related reason. No matter what card she put in Uber, she would see "payment declined", even when the card was well below the limit, and she would not see any attempted transaction on the bank website. Uber customer support was non-existent. She eventually got a new phone, made a new account, and gave them a CC number they'd never seen before. Things just magically started working.