Comment 8 for bug 1950382

The short answer is that FIPS support has been temporarily removed from erlang when using openssl 3.0 (as is used in el9):

https://github.com/erlang/otp/commit/6bb9c51e900fe8fb5a88bd2498f6e5a92f94ed8d

We have been patching erlang in cbs to somewhat make it work until now, but the behavior in openssl seems to have changed such that our previous hack is no longer working. Given that upstream has completely removed support for the time being, I'm not sure we can easily get it functioning again.