All MLS playoff matches will stream at no additional charge for Apple TV subscribers, without requiring the separate MLS Season Pass add-on (via Sports Business Journal).

Apple MLS partnership June 2022
Apple and MLS are likely using the expanded access window to convert casual viewers into paying Season Pass customers for the 2026 regular season. Apple adjusted Season Pass pricing in September; for ‌Apple TV‌ subscribers, the price for a full season was cut from $79 to $25 and for non-subscribers, from $99 to $29. During the…