moderated Re: windows defender
You really would not want to permanently disable Windows Defender (or a third party security suite, were you using one).
I can tell you how to temporarily disable it, should that become necessary, but suggest you read the page, Manage Slack connection issues | Slack, before we'd go there.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Tolerance is the positive and cordial effort to understand another's beliefs, practices, and habits without necessarily sharing or accepting them.
~ Joshua Liebman