This is not terrible unless you have quite a bit of customization.
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I have exactly the same situation. I have blocked two of my Alexa dots by mistake and couldn't unblock it using online site . Every time I unchecked the Block Internet choice and press Save, it gives me "Sorry! unable to create schedule, Date and Time not selected properly." Call the support and the representative blocked 6 more devices without being able to unblock them.
I have the most current Fios router and have tried everything from setting block time to 1 min to unchecked the block internet checkbox. Nothing works for me. On my FIOS app, all devices are enabled and not blocked. But in reality, all my Dots cannot connect to the internet.