For modern SharePoint sites, the distinction between the "Site Logo" and "Site Logo Thumbnail" is important, as they serve different purposes across SharePoint and the Microsoft 365 ecosystem. The site logo appears in the site header, while the site logo thumbnail is used in search results, site cards, when copying / moving files, and other areas. It is a critical component used by end users to differentiate between various SPO sites and Teams.

For many of my clients, they want to apply branding and standardize the look and feel of sites they are provisioning. This needs to be done in a scalable and repeatable manner (i.e. PnP powershell / Power Automate / Rest API / Azure Automation, etc.). The Set-PnPWebHeader offers a nice set of options but is missing the ability to set the Logo Thumbnail. In fact I can't find any other way outside of PnP SDK Core (which isn't an option for many clients).

I'm requesting for the Set-PnPWebHeader to have an attribute -SiteLogoThumbnailURL added to it's capability to address this gap.