'Release deployment completed event Azure Pipeline and Slack

I am configuring Azure DevOps integration in Slack https://docs.microsoft.com/en-us/azure/devops/pipelines/integrations/slack?view=azure-devops

I am using below command,

/azpipelines subscriptions 
     https://dev.azure.com/Company/Project/_release?_a=releases&view=mine&definitionId=xx

But it will add 3 events,

1) Deployment started
2) Deployment completed
3) Deployment approval 

I wanna only configure 1 event like Deployment completed.

Also, for some ASP.NET release pipelines, when I run the command /azpipelines subscriptions release-url, I get nothing and it shows the result of /azpipelines subscriptions, where I can find the logs where this is not working?



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