Why arm template for postres flexible server fails with version 14 in west europe location?

Hi All,
I am using ARM templates with Azure Pipelines to maintain the Infrastructure as Code approach in my project. I was using PostgreSQL v11, but because this is deprecated in Azure now, I upgraded it via the Azure Portal to version 14. Upgrade finished successfully.
To adapt to the version change, I modified the PostgreSQL ARM template's property version from 11 to 14. Unfortunately, during the deployment, I'm getting the error:

The value of the 'Version' should be in: [15,16,17]. Verify that the specified parameter value is correct. (Code: ParameterOutOfRange)

I want to ask why this is a problem? The server is already using version 14.18; there was no other change. The WestEurope location is supporting version 14, according to the output of az postgres flexible-server list-skus command.

 "supportedServerVersions": [
      {
        "name": "11",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "12",
          "13",
          "14",
          "15",
          "16",
          "17"
        ]
      },
      {
        "name": "12",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "13",
          "14",
          "15",
          "16",
          "17"
        ]
      },
      {
        "name": "13",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "14",
          "15",
          "16",
          "17"
        ]
      },
      {
        "name": "14",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "15",
          "16",
          "17"
        ]
      },
      {
        "name": "15",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "16",
          "17"
        ]
      },
      {
        "name": "16",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": [
          "17"
        ]
      },
      {
        "name": "17",
        "reason": null,
        "status": null,
        "supportedFeatures": [],
        "supportedVersionsToUpgrade": []
      }
    ],

Azure PostgreSQL 14 version is still supported until November 2026.