Problem webapp Wordpress on Linux Azure

@JulienMAURIER-5459, Welcome to Microsoft Q&A! Thanks for posting the question and sharing the solution that worked for you.

For benefiting the community, summarizing the scenario:

Scenario: Unable to deploy Wordpress on Linux App Service WebApp.
Error: The deployment shows the following error.

{
  "code": "DeploymentFailed",
  "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/DeployOperations for usage details.",
  "details": [
    {
      "code": "Conflict",
      "message": "{\r\n  \"Code\": \"Conflict\",\r\n  \"Message\": \"Parameter with name DATABASE_HOST already exists.\",\r\n  \"Target\": null,\r\n  \"Details\": [\r\n    {\r\n      \"Message\": \"Parameter with name DATABASE_HOST already exists.\"\r\n    },\r\n    {\r\n      \"Code\": \"Conflict\"\r\n    },\r\n    {\r\n      \"ErrorEntity\": {\r\n        \"ExtendedCode\": \"01013\",\r\n        \"MessageTemplate\": \"Parameter with name {0} already exists.\",\r\n        \"Parameters\": [\r\n          \"DATABASE_HOST\"\r\n        ],\r\n        \"Code\": \"Conflict\",\r\n        \"Message\": \"Parameter with name DATABASE_HOST already exists.\"\r\n      }\r\n    }\r\n  ],\r\n  \"Innererror\": null\r\n}"
    }
  ]
}

Typically, the error message may occur if you're using the database host name which already exists. In this case, use a different host/parameter name so there is no name conflict.

Solution that helped- "It was du to the portal app. I've tried in standard web browser and it worked :) " (Copied from the "Edit" on the post).