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Thanks for getting in touch. From inspecting your site and public REST endpoints I can see that it’s possible that Site Kit is using variations of your site protocol (https/http), given a possible mismatch.
In order to try and resolve this, can you apply the same “WordPress Address (URL)” and “Site Address (URL)” for your site by visting your site settings (Settings > General), applying https to both addresses? After doing so, please attempt Site Kit set up once more.
If the same occurs, please share your Site Health information and we can inspect this further.