It looks like the shortlived profile was launched in June but still shows as not generally available. Apparently there is an allowlist but no details on how one gets on said list?
jsteel@ubuntu:~/.acme.sh$ acme.sh --list-profiles
[Fri Nov 21 19:23:57 UTC 2025] Fetching profiles from LetsEncrypt.org (https://acme-v02.api.letsencrypt.org/directory)...
name info
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classic https://letsencrypt.org/docs/profiles#classic
shortlived https://letsencrypt.org/docs/profiles#shortlived (not yet generally available)
tlsclient https://letsencrypt.org/docs/profiles#tlsclient
tlsserver https://letsencrypt.org/docs/profiles#tlsserver
I'm able to use it on staging but would like to try it out on one of my productive domains. Is it possible to request early access? Or if the load of 6 day certs is too high, maybe a mediumlived profile could be made available? Something like 13 or 29 days?