Hello @user51744 ,
This is mostly a hypothesis, but it might be WeChat's system that checks to make sure links are safe compunding and/or conflicting with Cloudflare's anti-bot checks. Otherwise, we wouldn't really have any insight on this, since other people outside of WeChat are getting through (such as me just now when checking the links). You may want to reach out to WeChat support to see if they'd have more insight on why the Cloudflare anti-bot system would be giving errors when the link is accessed in their program.
Otherwise, if there's something else common for the people accessing it through WeChat, such as all of them using the same VPN service, or connected on the same office's internet network, that may also be a source of conflict with Cloudflare's anti-bot checks.
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