Squarespace SSL Error

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the domain is grainstore.com.au

Was your website working in HTTPS before you use Cloudflare?

I’m afraid I wasn’t involved with the old website, but I believe it was using HTTPS (I don’t remember seeing issues when visiting). The Squarespace site has been created from scratch (and HTTPS was working with Squarespace’s temporary domain) and the domain DNS has just been updated to point to the new site