It is being blocked by Telstra Broadband Protect as Sophos AV has it blacklisted as a malicious site.
You will need to get your site delisted from the Sophos AV blacklist and then when the Telstra Broadband Protect block page comes up, click on the link that is on the page to report as safe and the team that looks after TBP will reassess and unblock your site.
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.
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