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Here's the command line and the result:

pierce@ros2-terminal:~/ssp_ws$ ros2 topic pub /att ssp_interfaces/msg/Attitude "{yaw:1.0}"
Failed to populate field: 'Attitude' object has no attribute 'yaw:1.0'

Tbh your response to Mike trying to help made me almost skip your question, but you're missing a space:

{yaw:1.0}

isn't valid yaml:

ERROR:

while scanning a plain scalar
  in "<unicode string>", line 1, column 2:
    {yaw:1.0}
     ^
found unexpected ':'
  in "<unicode string>", line 1, column 5:
    {yaw:1.0}
        ^
Please check https://pyyaml.org/wiki/YAMLColonInFlowContext for details

if you change it to {yaw: 1.0} it should work.