Singer-songwriter Sevyn Streeter was scheduled to sing the National Anthem ahead of the 76ers' season opener against the Thunder, but that performance didn't happen.
Streeter tweeted a video where she said her anthem performance was stopped because of her "We Matter" jersey. She added that the order came from the 76ers organization.
She said: "I'm at the 76ers game to sing the National Anthem, and the organization is telling me that I can't because I'm wearing a 'We Matter' jersey."
This came one day after the NBA unveiled a "Together" campaign, promoting unity in the wake of the recent protests during the national anthem started by 49ers quarterback Colin Kaepernick.
The 76ers said in a statement to USA TODAY Sports:
"The Philadelphia 76ers organization encourages meaningful actions to drive social change. We use our games to bring people together, to build trust and to strengthen our communities. As we move from symbolic gestures to action, we will continue to leverage our platform to positively impact our community."