Sharepoint add domain to whitelist

[wackawacka]

trying to add a domain to the whitelist of a site which the code runs and works adding to the site in the back end but it doesn't add it to the front end so the person (external) doesn't have access as the domain is still blocked? 

{
"SharingCapability":1,
"DefaultLinkPermission":0,
"DefaultSharingLinkType":0,
"SharingDomainRestrictionMode":1,
"SharingAllowedDomainList":"@{variables('Domain')}"
}

above is run, tried to set SharingDomainRestrictionMode to 0 then send another to above but still doesnt work?!?!?! its driving me insane!! when i run a http request to query the list it returns the domains with the one i added in but when i manually go into the admin center to see the domain in the list its not there? what am i possibly missing here? 

[wackawacka]

just to update i have tested out by writing a test domain overwriting the default and it does overwrite but its not reflected as i get this warning: 

and

if i was to click on "add domain" it would just reset back to the parent level domain list! ARRRRHHHHHHH... is there any way to amend the parent level list instead of at the site level??????

[wackawacka · Accepted solution]

answered my own question here: 

adding approved domains into white list via rest and flow - SharePoint Stack Exchange