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While a *G BP is the easiest way to get lounge access, sometimes that fails to be on the BP. So as a backup you might then need to produce a digital *G card with UA's app, with *A Gold symbol and/or bar code.

To get the bar code, tap on the card and it flips over.

For displaying the *A Gold emblem, the two major smartphone apps work differently

For IOS/Apple you need to move the card to the Apple Wallet.

For Android, the front of the card shows the *A Gold symbol but it is not very large.
Should work as is, but if need be, you can enlarge by enabling the triple tap magnifier or screen capture to Gallery and enlarge the picture.

From Recent Denials of admission to *A Lounges due to lack of UA *G card [2019-2020], it appears *G BP or the digital card is sufficient for lounge access. The past issues requiring the physical card are "past history" unless one can not produce a *G BP or UA app digital card.