Single Sign into Jasper is not working for some users

Document ID : KB000095385
Last Modified Date : 10/05/2018
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After enabling Jasper Single Sign  On  (SSO) some users can sign in successfully while others cannot.
This is caused by usernames that have special characters in them.
Special characters in usernames are not currently supported as of 10.2.3 and Jasper 6.3/6.4.2.
The workaround is to rename those user IDs to not have the special character in them.