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I am looking for a solution to apply existing theme in SharePoint Modern Site using code.

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The Official Documentation on Microsoft gives us a few REST calls to manage your tenant themes:

http://<site url>/_api/thememanager/AddTenantTheme
http://<site url>/_api/thememanager/RemoveTenantTheme
http://<site url>/_api/thememanager/GetTenantThemingOptions

Since add/removing themes is a tenant scoped feature, you must have the clearance to manage them (Tenant Admin).

If you wish to apply a classic theme to a modern site, here is a link that gives a script to use.

To select the correct theme in a site, this is a manual procedure (I haven't found an endpoint, but there may be) which is pretty simple (Cog in the ribbon > Change the look > Select your theme).

Rolling out pretty soon (announced without a release date I believe), Hub sites will automatically apply the hub theme to any site you decide to attach.

Hope this helps!

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