Error reporting:

Solution: enable agent and select the available agent
setting – proxy – use postman desktop agent – Bowser agent

In addition:
if the selected agent is available, there will be a green tick about agent selection in the lower right corner. Here the Bowser agent is available:

if the selected agent is not available, it will turn into a red exclamation mark and prompt at send that the agent is not available:
Desktop agent is not available here: