Verified 

Verified with:
- Satellite 6.9.0 snap 11
- tfm-rubygem-foreman_rh_cloud-3.0.14-1.el7sat.noarch

Test steps:
1. Create an activation key with service level set in it.
2. Register the system using the activation key.
3. Generate report.

Observation:
- Generated report had "system_purpose_sla" fact in it.

Note: The fix for this on Subscription watch side is tracked at https://bugzilla.redhat.com/show_bug.cgi?id=1927751

I see similar behavior, 

Satellite 6.8.1

Client, running RHEL 8.3:
[root@rhel7to8 ~]# subscription-manager status
+-------------------------------------------+
   System Status Details
+-------------------------------------------+
Overall Status: Current

System Purpose Status: Matched

[root@rhel7to8 ~]# syspurpose show
{
  "role": "Red Hat Enterprise Linux Server",
  "service_level_agreement": "Premium",
  "usage": "Production"
}

Satellite is configured to use Insight with account number 5910538, and the check connection test reports success

Changing entries on the Content tab in Satellite for a system results in an update on the Client. For example:

[root@satellite ~]# hammer host show --id rhel7to8.yceconsulting.com
Id:                       11
 ==== OUPUT CLIPPED ====
 Subscription Information:
     UUID:                          378b1f36-773a-4d8f-94fa-f645192a9962
     Last Checkin:                  2021-02-24 17:09:16 UTC
     Release Version:               8.3
     Autoheal:                      true
     Registered To:                 satellite.yceconsulting.com
     Registered At:                 2021-02-24 15:20:47 UTC
     Registered by Activation Keys:
      1) 235-rhel8-key
     System Purpose:
         Service Level:  Premium
         Purpose Usage:  Production
         Purpose Role:   Red Hat Enterprise Linux Server
         Purpose Addons:
 Host Collections:
  1) Id:   2
     Name: default

Change the syspurpose from the Content tab to Self-Support, re-run "hammer show":
Subscription Information:
    UUID:                          378b1f36-773a-4d8f-94fa-f645192a9962
    Last Checkin:                  2021-02-24 17:09:16 UTC
    Release Version:               8.3
    Autoheal:                      true
    Registered To:                 satellite.yceconsulting.com
    Registered At:                 2021-02-24 15:20:47 UTC
    Registered by Activation Keys:
     1) 235-rhel8-key
    System Purpose:
        Service Level:  Self-Support
        Purpose Usage:  Development/Test
        Purpose Role:   Red Hat Enterprise Linux Server
        Purpose Addons:
Host Collections:
 1) Id:   2
    Name: default

The client reports the data correctly:
[root@rhel7to8 ~]# syspurpose show
{
  "service_level_agreement": "Self-Support",
  "usage": "Development/Test"
}

However, nothing is reported up to cloud.redhat.com with respect to syspurpose. Here is the client entry from https://cloud.redhat.com/api/inventory/v1/hosts?page=1 for this system. Note the "facts" section has no data:
{
     "insights_id": "f0245603-bf47-4e28-8e05-282ca120bf8e",
     "rhel_machine_id": null,
     "subscription_manager_id": "378b1f36-773a-4d8f-94fa-f645192a9962",
     "satellite_id": "378b1f36-773a-4d8f-94fa-f645192a9962",
     "bios_uuid": "5e8ac7ba-d775-429a-a448-74491283a5c8",
     "ip_addresses": [
       "192.168.0.162",
       "192.168.122.1"
     ],
     "fqdn": "rhel7to8.yceconsulting.com",
     "mac_addresses": [
       "56:6f:7d:de:00:03",
       "00:00:00:00:00:00",
       "52:54:00:28:a8:be",
       "52:54:00:28:a8:be"
     ],
     "external_id": null,
     "id": "f0b06cbd-a715-4bc4-a6a7-8b053367c618",
     "account": "5910538",
     "display_name": "rhel7to8.yceconsulting.com",
     "ansible_host": null,
     "facts": [],
     "reporter": "puptoo",
     "stale_timestamp": "2021-02-25T19:46:35.935134+00:00",
     "stale_warning_timestamp": "2021-03-04T19:46:35.935134+00:00",
     "culled_timestamp": "2021-03-11T19:46:35.935134+00:00",
     "created": "2021-02-24T15:32:06.816241+00:00",
     "updated": "2021-02-24T17:46:36.002252+00:00"
   },

Satellite updates cloud.redhat.com with the client info; it is seen in Insights, but the syspurpose is not updated via Satellite. This is critical when enabling SCA and SW.

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 (Moderate: Satellite 6.9 Release), 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-2021:1313

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 500 days