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Power Automate - Connector Development
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Custom connector error Invalid parameters template. No property names specified in @headers

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Hello, I am trying to configure a custom connector for a specific Aauth 2 Wep API. This service requires authentification by username/password + Client secret.
I figured out I need to configure the conenctor as No authentification and pass the token by Policies
 
I succeeded to acquire the token and copy it into environment variable but when I try to request by API I have this error :
 
I checked that my header is correct :
I also try to execute Curl request generated by the editor wich works well on reqbon.com
 
Does anybody can give me a hint to solve my problem ?
 
Thank you for reading and have a nice day
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