ERROR: Action test failed on step run

Hello,

Eric and team, thank you for picking up the development of rdiff-backup.

I am in the process of upgrading all of our servers to 2.2.5. My backup 
strategy is remote source and local destination. OS is FreeBSD, Python 
3.9, rdiff-backup 2.2.5, on both sides of the connection.

    $ rdiff-backup test host::/
    WARNING: this command line interface is deprecated and will
    disappear, start using the new one as described with '--new --help'.
    Testing server started by:  b'ssh -C host rdiff-backup --terminal-verbosity 3 --server'
    - Server OK


As I understand it, the warning is coming from the server due to 
'--server'. Setting the API version per the docs:

    $ rdiff-backup--api-version 201  test host::/
    Testing server started by:  b'ssh -C host rdiff-backup --terminal-verbosity 3 server'
    - Server tests failed due to ERROR:   Action test failed on step run


Test fails. Am I incorrect in my understanding that 2.2.5 has API 201? 
What am I missing?

Best,

Charles