I cannot upgrade my SharePoint site collections to 2013 after the Wave15 upgrade

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I have received this common question for customer’s Office 365 Education tenants who were upgraded to Wave15.  They receive this error:

 

Prepare for takeoff!

Upgrade is currently disabled for your site collection. Please check back later to see if it has been unlocked for you.

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The resolution to this issue is found here.

 

You can watch the step by step on how to fix this here as well: