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What are the rules for specifying an IBM ID for those who are prompted to register again?

April 26, 2017IBM Id prompted REGISTER rules specifying

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What are the rules for specifying an IBM ID for those who are prompted to register again?

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• must be only single-byte characters • must be at least 3 characters long • must not be longer than 31 characters • cannot contain any spaces • can contain only numbers (0-9), upper and lower case letters (A-Z, a-z), hyphens (-), underscore (_), and periods (.