Shibboleth IDP v4.0 to v4.16 Upgrade - Broken AuthN Flow - Help Required

[Cantor, Scott]

>    I am assuming the file you mentioned as missing under “<IDP home>/flows/authn/AkamaiMfa-flow.xml” is
> other than those two ?

No, it's exactly those. [1] includes discussion of custom flow registration, with a literal example of doing so for login flows.

-- Scott

[1] https://shibboleth.atlassian.net/wiki/spaces/IDP4/pages/1265631699/SpringConfiguration