Jay-Z’s recent concert at Yankee Stadium hit setbacks after fans noted equipment glitches. The crowd waited after their phones failed to sync . Some screens went dark mid-set. An actor stood in for Mary J. Blige after she faced an issue. Teyana Taylor stepped in later to help . Blue Ivy Carter took the keys for part of the show. Dame Dash then claimed Jay-Z’s recent stadium gigs felt more like commercial tests than real performances .