Radtest doesn't work with a clean install of Freeradius 4.0.0

I have a clean install of freeradius (FreeRADIUS version 4.0.0 (git #d9a670c)). I haven't changed any configuration files, the installation was done by a git checkout and then building it on Ubuntu. I am trying radtest as described here: https://github.com/FreeRADIUS/freeradius-server/blob/ce92146386b30bd7f9f5768... radtest test test localhost 0 testing123 This gives me a radclient:: Unknown attribute "User-Name" requires a hex string, not "test" I tried a radtest 0x123 test localhost 0 testing123 Which gives me a Unknown vendor name in attribute name "User-Name"