Repository: microsoft/semantic-kernel
File: dotnet/src/Connectors/Connectors.AzureOpenAI/Core/AzureClientCore.ChatCompletion.cs (C#)

Code before:
            return ChatResponseModalities.Default;
        }

        if (executionSettings.Modalities is ChatResponseModalities responseModalities)
        {
            return responseModalities;
        }

        if (executionSettings.Modalities is IEnumerable<string> responseModalitiesStrings)
        {
            return ParseResponseModalitiesEnumerable(responseModalitiesStrings);
        }

        if (executionSettings.Modalities is string responseModalitiesString)
        {
            if (Enum.TryParse<ChatResponseModalities>(responseModalitiesString, true, out var parsedResponseModalities))
            {
                return parsedResponseModalities;
            }
            throw new NotSupportedException($"The provided response modalities '{responseModalitiesString}' is not supported.");
        }

        if (executionSettings.Modalities is JsonElement responseModalitiesElement)
        {
            if (responseModalitiesElement.ValueKind == JsonValueKind.String &&
                Enum.TryParse<ChatResponseModalities>(responseModalitiesElement.GetString(), true, out var parsedResponseModalities))
            {
                return parsedResponseModalities;
            }

            if (responseModalitiesElement.ValueKind == JsonValueKind.Array)
            {
                var modalitiesEnumeration = JsonSerializer.Deserialize<IEnumerable<string>>(responseModalitiesElement.GetRawText())!;
                return ParseResponseModalitiesEnumerable(modalitiesEnumeration);
            }

            throw new NotSupportedException($"The provided response modalities '{executionSettings.Modalities?.GetType()}' is not supported.");
        }

        return ChatResponseModalities.Default;
    }

    /// <summary>
    /// Gets the audio options from the execution settings.
    /// </summary>
    /// <param name="executionSettings">The execution settings.</param>
    /// <returns>The audio options as a <see cref="ChatAudioOptions"/> object.</returns>
    private static ChatAudioOptions GetAudioOptions(OpenAIPromptExecutionSettings executionSettings)
    {
        if (executionSettings.Audio is ChatAudioOptions audioOptions)
        {

Review comment (bug):
We should probably throw if the element is a string but we cannot parse the enum here with an error similar to above:
```csharp
NotSupportedException($"The provided response modalities '{responseModalitiesString}' is not supported.");
```
otherwise, when the element is a string, but the enum cannot be parsed, the error message would be that the type is not supported, but this is incorrect.  We do support the type, just not the string in it.

Code after:
            return ChatResponseModalities.Default;
        }

        if (executionSettings.Modalities is ChatResponseModalities responseModalities)
        {
            return responseModalities;
        }

        if (executionSettings.Modalities is IEnumerable<string> responseModalitiesStrings)
        {
            return ParseResponseModalitiesEnumerable(responseModalitiesStrings);
        }

        if (executionSettings.Modalities is string responseModalitiesString)
        {
            if (Enum.TryParse<ChatResponseModalities>(responseModalitiesString, true, out var parsedResponseModalities))
            {
                return parsedResponseModalities;
            }
            throw new NotSupportedException($"The provided response modalities '{responseModalitiesString}' is not supported.");
        }

        if (executionSettings.Modalities is JsonElement responseModalitiesElement)
        {
            if (responseModalitiesElement.ValueKind == JsonValueKind.String)
            {
                var modalityString = responseModalitiesElement.GetString();
                if (Enum.TryParse<ChatResponseModalities>(modalityString, true, out var parsedResponseModalities))
                {
                    return parsedResponseModalities;
                }

                throw new NotSupportedException($"The provided response modalities '{modalityString}' is not supported.");
            }

            if (responseModalitiesElement.ValueKind == JsonValueKind.Array)
            {
                try
                {
                    var modalitiesEnumeration = JsonSerializer.Deserialize<IEnumerable<string>>(responseModalitiesElement.GetRawText())!;
                    return ParseResponseModalitiesEnumerable(modalitiesEnumeration);
                }
                catch (JsonException ex)
                {
                    throw new NotSupportedException("The provided response modalities JSON array may only contain strings.", ex);
                }
            }

            throw new NotSupportedException($"The provided response modalities '{executionSettings.Modalities?.GetType()}' is not supported.");
        }