What do you mean with “AppleSeed“. Never heard of.

You need to enable the entitlement in your App ID.

This works for me too, but only for the "iOS Team Provisioning Profile". When I try to validate / distribute the app, the "iOS Team Store Provisioning Profile" is used, which unfortunately doesn't include the entitlement. Or do you have configured a profile for your app? I thought when using Cloud managed certificates, neither a custom distribution certificate nor a profile is needed. At least it wasn't until I enabled the entitlement in the App ID.