To authorize all users, just omit using the Authorize attribute alltogether. To authorize authenticated users, use the Authorize attribute. To authorize specific roles or users, that is when you'll have Authorize (Users = "someuser") or Authorize (Roles = "somerole") .
Looking at the documentation for the attribute it doesn't look like you can use it that way. By default the AuthorizeAttribute only allows access to authenticated and authorised users so passing * (all) or? (guest) doesn't make sense.
The Users property is used to further restrict the list of authenticated users who can access the Action method along with the Roles property which can also be used to further filter any authenticated access.
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