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Re:Show HN: Never have an SSL certificate expire again by knorker on Wednesday February 09, 2022 @03:07PM (#30277717)
I've not used Heroku, but likely it's because they don't give you IPv6 in the thing that does the checking.

Try https://ipv6.google.com/

On your page I get:

    connect ENETUNREACH 2607:f8b0:4004:c08::8a:443 - Local (:::0)

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