A creator most often doesn't appear in Creator Finder because they have turned off TikTok's "Show sellers detailed sales performance data" privacy setting.
The creator turned off their TikTok sales-data privacy setting
When a creator turns off TikTok's "Show sellers detailed sales performance data" privacy setting, Soco can't read their Video or Live GMV. If Soco can estimate their GMV from public signals, they stay in the index with Total GMV shown as a range. If not, they drop out of the index entirely.
For the creator-side view of this setting, see Can I hide my Video and Live GMV from Soco?
The creator is below Soco's top-10,000-per-market threshold
Creator Finder indexes the top 10,000 TikTok Shop affiliates per market. Creators below that threshold by GMV won't appear yet. Smaller or newer creators may not show up until they cross into the top 10K.
The creator is outside the US
Creator Finder is currently live in the US only. Creators in other countries won't appear yet, even if they sell on TikTok Shop. Coverage is per market: each new market gets its own top-10,000 index as Soco rolls out.
The handle is wrong
The username you're searching may not match the creator's exact TikTok handle. Copy the handle from their TikTok profile URL (the part after @ in tiktok.com/@handle) and search that.
In short
A creator you can't find in Creator Finder is most often hiding their data via TikTok's "Show sellers detailed sales performance data" privacy setting. Less likely causes are being below the top-10K-per-market threshold, being outside the US, or a wrong handle.