Can't see Managed App Installation UI option in apple enterprise account. But can see same option in developer account. Kindly help

Hi I have tried the code given on link https://developer.apple.com/documentation/appdistribution/fetching-and-displaying-managed-apps. This code is not compilable in Xcode 16.1. After some fixes i am able to run the code but i am getting Error registering for message: [App catalog changed]: An unspecified, unrecoverable error occurred. Kindly help me with this.

I am trying ManagedAppDistribution framework for enterprise bundle id Managed App Installation UI is not visible where as for company account bundle ID Managed App Installation UI option is visible. is it something wrong with my enterprise account? Kindly provide details