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When you set a password on a workspace and allow guest users, they will still be prompted for a password. This is so you can create a "locked" public link. That way you can have a public link that is still open to non-SmarterMail users (Guests) but is still locked down, so not everyone with a link can join.
If you wish to have guest functionality with no logins at all (not even a password), you'll wanna remove the password you set on the workspace.