subscriptionGroupLookups API returns 404 - No LookUp Key assigned to my subscription group

Hello,

I'm encountering an issue when trying to use the subscriptionGroupLookups endpoint in the App Store Connect API.

Despite having the correct setup, I continue to receive a 404 NOT FOUND error when making requests to:

GET https://api.appstoreconnect.apple.com/v1/subscriptionGroupLookups

Here is the current state of my environment:

• I am the Account Holder of the App Store Connect account
• The App Store Connect API key has been successfully created
• I have the correct Key ID, Issuer ID, and .p8 private key
• I can authenticate and access the apps and subscriptionGroups endpoints
• However, the subscriptionGroupLookups endpoint always returns:

{ "errors": [ { "status": "404", "code": "NOT_FOUND", "title": "The specified resource does not exist" } ] }

I suspect that LookUp Keys (UUIDs) have not been assigned to our subscription groups, even though they were created and are active in App Store Connect.

There is no “Request Access” button visible under the Integrations tab (as mentioned in Apple support instructions), and my keys appear under “App Store Connect API” > “Keys” as active.

Questions:

• How can I ensure that LookUp Keys are assigned to my subscription groups?
• Is there a way to trigger this manually or via support?
• Has anyone successfully resolved this?

Any advice or experience would be greatly appreciated.

Thank you!