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The Hidden Cost of Scoped Context IDs in Sitecore XMC

When working with Sitecore XM Cloud (SitecoreAI), Next.js, and the Sitecore Content SDK, scoped Context IDs are strongly recommended — especially for values exposed to the browser.

I followed the official Sitecore documentation, created a scoped Context ID, wired it into my Next.js app… and still ended up with a runtime error that wasn’t obvious at all.

This post documents what went wrong, why the error message is misleading, and what you actually need to scope correctly.