Bug#999862: sso.debian.org: SSO no longer seems to work

Package: sso.debian.org
Severity: serious

I'm trying to log in to tracker.debian.org.  I've manually created a
fresh certificate and loaded it into both Firefox (94.0-1) and Chrome
(from Google), I visit tracker.debian.org but it does not recognise it
at all.  I also tried curl, as described on the wiki page
https://wiki.debian.org/DebianSingleSignOn:

curl --key $USER.key --cert $USER.crt https://sso.debian.org/ca/test/env

but that fails too.

So it would seem that sso.debian.org may no longer be functional,
which prevents me from logging into tracker.debian.org.

I don't know if this is a bug with tracker.debian.org or with
sso.debian.org so I'm starting with sso.debian.org.  I know the Wiki
says that SSO is deprecated, but it doesn't say that it's stopped
entirely!

Best wishes,

   Julian