The Jenkins setup window is not working after the destination screen

The following page in Jenkins is supposed to list the builds started by a specefic user:
https://<jenkins.domain>/user/<username>/builds

I’ve recently taken over a Jenkins instance that runs our C++ data pipeline on a nightly basis, but I’m a Jenkins noob. We had to let the previous engineer go and discovered that he was using personal keys fir GitHub and AWS, so deactivating his accounts broke our builds. I updated the keys to use service accounts and deploy keys, but now all of our nodes error on launch.

I am trying to register a Jenkins slave using swarm-client.jar file but I am facing the “SEVERE: Could not obtain CSRF crumb. Response code: 400” error.

I have a Jenkins agent running on Windows machine with openssh for Windows installed. My pipeline looks like this:

I’m trying to support backwards compatibility, to do so I need to add set a hidden parameter and i want it to hold the value of other param, any ideas how to do this?

A user on jenkins isn’t able to see the option “Build with parameters”, this job was recently created.
What i’ve checked already:

I migrated jenkins 2.373 which was on azure vm (centos) to a new azure vm (ubuntu jammy) .
jenkins is started and i am seeing everything. the jobs, the user, the plugins…
but the jobs pass only until a certain stage, mostly untill the end of build and then they fail.

(Jenkins-noob, so it can be that what I’m looking for is obvious, but I just don’t know it. I have searched both Google and here to find a similar question, but could not find it (but probably I searched wrong))

I ran into this error while trying execute Thin backup in Jenkins.