Add-PnPTenantTheme - Attempted to perform an unauthorized operation.

Hi Lee-Martin ,

Add-PnPTenantTheme tries to create a new theme that you can use tenant-wide in all site collections. You need SharePoint Admin permissions and you have to be connected to the admin site to use that command.

I use a PnP site template to  invoke a custom theme on a single site collection:

<?xml version="1.0"?>
<pnp:Provisioning xmlns:pnp="http://schemas.dev.office.com/PnP/2022/09/ProvisioningSchema">
  <pnp:Templates ID="ThemeTemplate">
    <pnp:ProvisioningTemplate ID="ThemeProvisioningTemplate" >
      <pnp:Theme Name="MyColorTheme" IsInverted="false">
        {
        "themePrimary": "#aaaaaa",
        "themeLighterAlt": "#fefcf6",
        "themeLighter": "#fcf3dd",
        "themeLight": "#fae8bf",
        "themeTertiary": "#f4d282",
        "themeSecondary": "#efbe4b",
        "themeDarkAlt": "#d5a32f",
        "themeDark": "#b48a28",
        "themeDarker": "#85661d",
        "neutralLighterAlt": "#f8f8f8",
        "neutralLighter": "#f4f4f4",
        "neutralLight": "#eaeaea",
        "neutralQuaternaryAlt": "#dadada",
        "neutralQuaternary": "#d0d0d0",
        "neutralTertiaryAlt": "#c8c8c8",
        "neutralTertiary": "#a9a9a9",
        "neutralSecondary": "#8d8d8d",
        "neutralPrimaryAlt": "#727272",
        "neutralPrimary": "#020202",
        "neutralDark": "#3a3a3a",
        "black": "#1e1e1e",
        "white": "#ffffff",
        "bodyBackground": "#ffffff",
        "bodyText": "#020202"
        }
      </pnp:Theme>
    </pnp:ProvisioningTemplate>
  </pnp:Templates>
</pnp:Provisioning>

Invoke-PnPSiteTemplate .\theme.xml

But there might be better ways to do so.

Best Regards,
Sven