The domain health-check status shows 'joined' despite of the domain is used in a realm.
Edge SWG (Proxy SG) 7.3.21 and beneath
Edge SWG (Proxy SG) 7.4.5 and beneath
The health status has to be changed to 'joined & use' when the domain is used in a realm.
There is no workaround for this.
It doesn't have any impact on the realm functionality as it's a cosmetic bug.
It will be fixed in version 7.3.22 (ETA the end of September 2024), and 7.4.6 (ETA is the first half of October 2024).