Veeam Backup AWS Script: Modify Policy

Hello,

I have more than 700 policies on my VBAws serveurs. I have ton change fiew setting.

I know how to create AWS Acoount / Policies 
I use PowerShell and Invoke-RestMethod 
 

I’m not able to modify polices: 
I do not find a way even in the swagger 

If someone can share the way to modify account or Policies 

nvoke-RestMethod -Uri $TheUrl -Method Put -Body $json -ContentType "application/json" -Headers $Headers -NoProxy -SkipCertificateCheck

Regards