Thanks for getting back to me @ironikus . I did try a real example and it did successfully show up at webhook.site but didn’t show up in MS Power Automate.
Here are some discussions/documentation on this Power Automate Trigger:
https://docs.microsoft.com/en-us/azure/connectors/connectors-native-reqres
https://flow.microsoft.com/fr-fr/blog/call-flow-restapi/
https://powerusers.microsoft.com/t5/General-Power-Automate/MS-Flow-Request-HTTP-Trigger/td-p/81930
I’ve managed to make this connection work using a different website on drupal, but something isn’t working with this specific plugin-power automate connection.
I did have a CF7-to-mailchimp plugin that may have been interfering. Will disable and try again and let you know here if that fixed it up.
