This is my experience:
YES
Apple.com
Staples.com (bought non-Staples gift cards)
Kidztopros.com
Costco.com
eBay (payment through PayPal)
Neiman Marcus
Amazon.com
Uber (ride + tip in app)
Amazon Go store
Turbotax (for state e-file)
Nike
Tea Collection
Baskin Robbins (ordered cake online for in store pickup)
Gilroy Gardens (for parking)
FastTrak (for replenishing credit)
NO
PGE.com
TMobile.com (post-paid account)
Kiehl's
Groupon
Chipotle (online order)
Lyft
Lady M
CONFERENCE CONCEPTS, IN
Amazon Prime (membership)
AAA (membership renewal)
Graco
Kiwico
Petco.com
Vendini.com
Straw Hat Pizza
skirose.com (Mt. Rose Ski lesson and pass)
subway.com (in-app purchase)
chargepoint
yamimeal (purchase in app)
safeway.com (grocery delivery)
bluebottle coffee
SOMETIMES
PayPal (not sure how it determines eligibility. These were not eBay purchases.)
NO
PGE.com
TMobile.com (post-paid account)
Comcast (internet bill)
AAA insurance (pay online)
Birkenstock Express
Birkenstock Express
recreation.gov
reservecalifornia.com (worked previously, but not Jan 2020)
subway.com (bought gift card in app)