Here’s a shortcut:
Step 1: Get the subdomain of the Slack channel you want to delete. For example “techambassadors.slack.com” has the subdomain: techambassadors.
Step 2: Add the subdomain to the delete link, like this:
https://techambassadors.slack.com/account/deactivate
Step 3: Paste the URL into your browser and follow the instructions. Simple dimple!

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