iPhone Volume Buttons No Longer Work with Spotify Connect

• Spotify users on iPhone can no longer control volume on connected devices using physical buttons due to Apple's discontinuation of the technology.
• The change affects Spotify Connect, requiring users to use an in-app slider for volume control starting September 3rd, though some users are already experiencing it.
• Spotify blames Apple for not providing access to the technology, causing instability and bugs with physical volume control on connected devices.
• Similar issues have been reported with the Sonos app, which also stopped allowing volume control via physical buttons on iPhones.
• Spotify claims Apple's restrictions could violate the EU's Digital Markets Act, which mandates platform openness to third-party services.

Source: The Verge