Flowdock - Administration: User signup gives "should look like email address" error

Document ID : KB000111815
Last Modified Date : 21/08/2018
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When using Login using Agile Central to set up a new user account, the email address is not accepted. 

The user may receive an error such as "should look like an email address" when there is a special character in the email: 

User-added image
Special characters such as apostrophes are not accepted in email addresses for Flowdock.
Remove the special character (such as apostrophe) in the email address, then click Submit to create the Flowdock account.