Amazon.ca in Canada is one of the sites that appears to be supported but has been giving the following message for many weeks, if not months:
We’re currently doing some technical updates. Your reviews are in line to be collected. Once we’re done, they’ll appear in your widget. For now, you can save your widget and come back later to see the reviews."
How long should these technical updates take?
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Hi there, @Joe_Sarkic 
I am so sorry about this inconvenience!
Could you please send me a link to the source you were trying to add?