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To my understanding, no, you have to travel before expiry. But if you are buying a further flexipass, you can extend validity of unused tickets to match that of your new flexipass (which is a change from prior practice, whereby you could apply some unused tickets to the cost of the new flexipass).
We are aware of an issue with emails from the Forum to Microsoft-based email accounts (hotmail/outlook/live.com email addresses). This is being looked into currently, thanks for your patience meanwhile.