If you or your users are using gmail or google workspace, "Sign-in with Slack" is an easy way to make sure everyone can sign in with their usual accounts from Slack.

Just go to Admin > Hub, and there you'll find the setting to activate "Continue with Slack".

If you are signed in as an Admin for your account, you can click here to go direct to that page.

Note that you might have to allow this in your Slack admin.