Site themes via Rest.
I tried following at https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/site-theming/sharepoint-site-theming-rest-api I keep getting the following response: <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Error</title> </head> <body> <pre>Cannot POST /_api/thememanager/AddTenantTheme</pre> </body> </html>
