Cannot create enum from us-iso-east-1 value!
So my operating philosophy is that plugin are very well meaning but remember, maintainers are volunteers. In that vein they (we) do the best we can to keep things up to date. That is not always possible.
My guess is the maintainer of this plugin would love a PR helping fix the issue. With that it may be a good thing to understand how to build and work with plugins: https://jenkins.io/doc/developer/plugin-development/
At the very least one could get involved in the community: https://jenkins.io/participate/