The 2026 Hall of Fame Game (Panthers vs. Cardinals) already took place on August 7 — the Cardinals lost 33–30. Jeremiyah Love is not mentioned in any of the game recaps in the wiki, which focus on the QB duel between Panthers UDFA Haynes King and Cardinals rookie Carson Beck (from the Haynes King page).
It's common for high-draft-pick running backs to be held out or see very limited snaps in the Hall of Fame Game, and that appears to be what happened here — Love wasn't a factor. You'll likely see his first real preseason action in one of the later exhibition games as the Cardinals ramp up his workload.