Site name should be "MoneySavingExpert.com" and not just "MoneySavingExpert". This is the name that they show on the homepage and also on most of their social media accounts.
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It's similar to the example they give in the checklist, where the site name is "elEconomista.es" and not "elEconomista".
https://instantview.telegram.org/checklist#3-2-link-preview