I have developed an app which can mass clone any sObject, which clones the records using the batch process and it runs dynamically(object and its field are fetched dynamically), Its working fine when the whole package is unmanaged but as soon as I make it managed, when I try to mass clone any record I get the above error
"System.RequiredFeatureMissingException: Object 'GroupSubscription' is not supported. One or more features must be enabled to access this object."
Can anyone please share any insights regarding this, like reason or any available solution for the same.
GroupSubscription
listed as a standard object. It's possible that it may have been deprecated and replaced by another object. Once you've applied your namespacing, that issue may be of more relevance than when the package was unmanaged.