When trying to add a new admin to your Citrix Cloud Organization, user is not able to complete registration after clicking sign-in button on received invitation.
Failing with error "We were unable to create your account".

Citrix will only create the account once the password chosen meets the minimum requirements. 

Passwords must be at least 8 characters long and include:
At least one number
At least one upper-case letter
At least one symbol: ! @ # $ % ^ * ? + = -
Your password includes dictionary words.
Your password is listed in a known database of compromised passwords.
You haven’t signed in to Citrix Cloud in the last six months.

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Problem Cause

In this case, password contain a dictionary word. 
Once a new password was set that met all requirements, issue no longer occurred.

When trying to add a new admin to your Citrix Cloud Organization, user is not able to complete registration after clicking sign-in button on received invitation. Failing with error "We were unable to create your account". ​​​​​​​