Site Collection Administrators - Site design JSON

Question

I would like to add a group to my site design which will be Site Collection Administrators.

I used such code in JSON while creating design:

{
     "verb": "addPrincipalToSPGroup",
     "principal": "customgorup@scustomgroup",
     "group": "Owners"
},

I thought I would get this kind of result:

My user is a part of this group, so when I set my design, as a member of customgroup I will be able to edit the whole site.

During the data migration tests I get the information that I am not the administrator of the collection.

I do not understand this since my group is an owner which means full access.

Answer 1

Currently adding user/group as Site Collection Administrators is not possible using Site design JSON.

addPrincipalToSPGroup action currently only supports the Visitors (permission level: read), Members (permission level: contribute or edit, depending on the site template), and Owners (permission level: full control) groups.

Source: Add users (principals) to SharePoint Groups

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Site owner & site collection administrator is not same entity. For more information, see Understanding SharePoint Groups.