Hi all
Since the API was migrated to Azure I have detected that my POST requests are responded with an error 405 : Request method 'GET' not supported, despite it is a POST endpoint and nothing has changed since the migration (I don't know if it is actually connected).
I have tried with POSTMAN and it works perfectly, it seems Power Platform has some kind of bug. Get requests work perfectly.
Found it!
It seems I created it as "http" instead of "https". I still don't know why the GET ones work (double checked).