No longer able to create ZIP file via SharePoint API

Hello,

since yesterday my PowerFlow fails when trying to create a ZIP via SharePoint API.

It was working fine for weeks.

This is the code:

{

  "type": "OpenApiConnection",

  "description": "Submits the request to the media server and downloads the Zip file",

  "inputs": {

    "parameters": {

      "dataset": "@{body('SharePointHTTP')['ListSchema']['.mediaBaseUrl']}",

      "parameters/method": "POST",

      "parameters/uri": "/transform/zip?cs=@{body('SharePointHTTP')['ListSchema']['.callerStack']}",

      "parameters/headers": {

        "Content-Type": "application/x-www-form-urlencoded"

      },

      "parameters/body": "zipFileName=test.zip&guid=@{guid()}&provider=spo&files=@{encodeUriComponent(outputs('Attachment_Items'))}&oAuthToken="

    },

    "host": {

      "apiId": "/providers/Microsoft.PowerApps/apis/shared_sharepointonline",

      "connection": "shared_sharepointonline_1",

      "operationId": "HttpRequest"

    }

  },

It fails with this message:

Bad Request, SharePoint Site Address 'https://northeurope1-mediap.svc.ms/' is not valid

See also:

https://community.powerplatform.com/forums/thread/details/?threadid=c383a416-d4b6-ef11-b8e8-7c1e524a3a16

Thank you 

Johannes