TokenResult
public enum TokenResultAsync result of attempting to retrieve a new subaio-token.
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                  Token successfully retrieved. DeclarationSwift case success(token: String)
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                  Token could not be retrieved for some reason, e.g. lost connection. Current token is retained and refreshing will be reattempted. DeclarationSwift case unavailable
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                  Authentication is no longer possible, ie. the user has logged out. Current token is removed and refreshing will not be attempted unless refreshToken is called. DeclarationSwift case unauthenticated
 TokenResult Enumeration Reference
        TokenResult Enumeration Reference