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

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.




The resolution to this issue is found here.


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


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