Zammad ADFS SAML 422: The change you wanted was rejected

I dug around a little through the containers but couldn’t find anything substantial:

$ pwd
/opt/zammad
$ cd log
$ pwd
/opt/zammad/log
$ cat production.log
I, [2023-07-18T14:57:38.823588#4418-6180]  INFO -- : Using Zammad's file store as Rails cache store.
I, [2023-07-18T14:57:38.823888#4418-6180]  INFO -- : Using the File back end for Zammad's web socket session store.
$ ls -l
total 4
-rw-r--r-- 1 zammad zammad 217 Jul 18 14:57 production.log