Azure service bus message delivery count is not increasing or is reset when topic subscription disabling/enabling - azure

Question

I have the following workflow:
Service bus receives messages.
Azure function triggers and tries to deliver this messages via HTTP to some service.
If delivery failed - function throws exception (custom) and disables topic subscription via code below:
The other function in parallel pings special health check endpoint of the service, and if it gets 200 - it tries to enable subscription and make the flow work again.
The steps could be reproduced N times, cause health check will return 200, thus the delivery url of point 2 - 4xx code.
After the next attempt to enable subscription and deliver the message, I expect that delivery count will be increased and in the end (after 10 deliveries attempt) it will get to dead-letter.
Actual - it equals 1.
I assume, that it may reset when I call CreateOrUpdate with status changed.
If yes - what is the other way to manage subscription status instead of Microsoft.Azure.Management package so that the messages delivery count will not be reset?
UPDATE: Function code
public static class ESBTESTSubscriptionTrigger
{
private static readonly HttpClient Client = new HttpClient();
private static IDatabase redisCache;
[FunctionName("ESBTESTSubscriptionTrigger")]
[Singleton]
public static async Task Run([ServiceBusTrigger("Notifications", "ESBTEST", AccessRights.Listen, Connection = "NotificationsBusConnectionString")]BrokeredMessage serviceBusMessage, TraceWriter log, [Inject]IKeyVaultSecretsManager keyVaultSecretsManager)
{
var logicAppUrl = await keyVaultSecretsManager.GetSecretAsync("NotificationsLogicAppUrl");
if (redisCache == null)
{
redisCache = RedisCacheConnectionManager.GetRedisCacheConnection(
keyVaultSecretsManager.GetSecretAsync("RedisCacheConnectionString").GetAwaiter().GetResult());
}
if (string.IsNullOrWhiteSpace(logicAppUrl))
{
log.Error("Logic App URL should be provided in Application settings of function App.");
throw new ParameterIsMissingException("Logic App URL should be provided in Application settings of function App.");
}
var applicaitonId = serviceBusMessage.Properties["applicationId"].ToString();
var eventName = serviceBusMessage.Properties.ContainsKey("Event-Name") ? serviceBusMessage.Properties["Event-Name"].ToString() : string.Empty;
if (string.IsNullOrWhiteSpace(applicaitonId))
{
log.Error("ApplicationId should be present in service bus message properties.");
throw new ParameterIsMissingException("Application id is missing in service bus message.");
}
Stream stream = serviceBusMessage.GetBody<Stream>();
StreamReader reader = new StreamReader(stream);
string s = reader.ReadToEnd();
var content = new StringContent(s, Encoding.UTF8, "application/json");
content.Headers.Add("ApplicationId", applicaitonId);
HttpResponseMessage response;
try
{
response = await Client.PostAsync(logicAppUrl, content);
}
catch (HttpRequestException e)
{
log.Error($"Logic App responded with {e.Message}");
throw new LogicAppBadRequestException($"Logic App responded with {e.Message}", e);
}
if (!response.IsSuccessStatusCode)
{
log.Error($"Logic App responded with {response.StatusCode}");
var serviceBusSubscriptionsSwitcherUrl = await keyVaultSecretsManager.GetSecretAsync("ServiceBusTopicSubscriptionSwitcherUri");
var sbSubscriptionSwitcherResponse = await Client.SendAsync(
new HttpRequestMessage(HttpMethod.Post, serviceBusSubscriptionsSwitcherUrl)
{
Content =
new
StringContent(
$"{{\"Action\":\"Disable\",\"SubscriptionName\":\"{applicaitonId}\"}}",
Encoding.UTF8,
"application/json")
});
if (sbSubscriptionSwitcherResponse.IsSuccessStatusCode == false)
{
throw new FunctionNotAvailableException($"ServiceBusTopicSubscriptionSwitcher responded with {sbSubscriptionSwitcherResponse.StatusCode}");
}
throw new LogicAppBadRequestException($"Logic App responded with {response.StatusCode}");
}
if (!string.IsNullOrWhiteSpace(eventName))
{
redisCache.KeyDelete($"{applicaitonId}{eventName}DeliveryErrorEmailSent");
}
}
}