Created redmine issue http://projects.theforeman.org/issues/28327 from this bug

Moving this bug to POST for triage into Satellite 6 since the upstream issue https://projects.theforeman.org/issues/28327 has been resolved.

see also
Bug 1787147 - An admin cannot GET subscription/manifest uploaded in org created by another admin

Verified in Satellite 6.7 Snap 10

[root@dhcp-3-103 ~]# curl -X GET -k -u admin:password https://my.sat.host/katello/api/v2/subscriptions/14 | python -m json.tool
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1030    0  1030    0     0   2189      0 --:--:-- --:--:-- --:--:--  2186
{
    "account_number": 477931,
    "activation_keys": [],
    "addons": null,
    "arch": "x86_64",
    "available": 1,
    "consumed": 0,
    "contract_number": -----,
    "cores": null,
    "cp_id": "-----",
    "description": "Red Hat Enterprise Linux",
    "end_date": "2022-01-01 04:59:59 UTC",
    "host_count": 0,
    "id": 14,
    "instance_multiplier": 1,
    "multi_entitlement": false,
    "name": "Red Hat Enterprise Linux Atomic Host",
    "product_id": "RH00384",
    "product_name": "Red Hat Enterprise Linux Atomic Host",
    "provided_products": [
        {
            "id": 81,
            "name": "Red Hat Enterprise Linux Atomic Host"
        },
        {
            "id": 84,
            "name": "Red Hat Enterprise Linux Atomic Host Beta"
        },
        {
            "id": 87,
            "name": "Red Hat Container Images"
        },
        {
            "id": 89,
            "name": "Red Hat Container Images Beta"
        }
    ],
    "quantity": 1,
    "ram": null,
    "role": null,
    "sockets": null,
    "stacking_id": null,
    "start_date": "2016-08-05 04:00:00 UTC",
    "subscription_id": 8,
    "support_level": "Layered",
    "support_type": "L1-L3",
    "type": "NORMAL",
    "unmapped_guest": false,
    "upstream": true,
    "upstream_pool_id": "-----",
    "usage": null,
    "virt_only": false,
    "virt_who": false
}

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1454