Format reader entitlement
Include an entitlement to indicate your extension is a MediaExtension format reader.
Overview
MediaExtension format readers must include a special entitlement key with a Boolean value set to true. To add the entitlement key in Xcode, follow these steps:
Select the build target for your format reader extension.
Go to the Signing & Capabilities tab.
Click + to add a new capability.
Choose Media Extension Format Reader from the list.
The entitlement key is com.apple.developer.mediaextension.formatreader and it must have a Boolean value set to true. Using this entitlement requires a developer provisioning profile.