Unable to use Microsoft.Management/serviceGroups as a resource scope #18097

Bicep version
All

Describe the bug

var sgName = 'mySG'

resource sg 'Microsoft.Management/serviceGroups@2024-02-01-preview' existing = {
  name: sgName
  scope: tenant()
}

resource site 'Microsoft.Edge/sites@2025-03-01-preview' = {
  scope: sg
  name: 'MySite'
  properties: {}
}

should produce the following scope on the site resource

 "scope": "[format('/providers/Microsoft.Management/serviceGroups/{0}', variables('sgName'))]",

but it produces

 "scope": "[format('Microsoft.Management/serviceGroups/{0}', variables('sgName'))]",

Because it's not absolute, it inherits the scope of the deployment. In the reported case, this was an RG deployment and user is unable to issue a tenant level deployment due to lack of permissions.

Suggested workaround was to compile the Bicep into an ARM template and make the manual edit, but this looks like a gap in support for service groups.

Additional context
This is a repair item created from an internal incident.