Your domain expiration and the https certificate expiration are two different distinct things. Your club handles the custom domain name and its renewal. However, in order to use https with your domain, you also need a security certificate, and we handle that for you via the free LetsEncrypt! service that our server code interacts with to get you the certificate.
When https usage became common, we had to come up with a reasonable way to support the security certificates for clubs using custom domain names. LetsEncrypt! allows us to do that. The fact that its certificates expire every 90 days just requires us to automate the renewals for the certificates.
However, your custom domain name renewals are *not* automated and you will have to renew it at some point with your domain registrar. This is the most common cause of snafus with clubs and custom domains... they do not renew them before the person who set it up leaves the club.
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