amazon's email intake is horrible. I have seen reports of them rejecting all sorts of epubs that display fine elsewhere. They are going to inconvenience a lot of people with this change.
Personally I suggest you stop relying on the email delivery service. It's too unreliable, for instance, the other day I had a report of it rejecting an epub simply because it had undecodable fonts in it. Fonts are entirely optional, they can be ignored if needed.
A publishing manuscript intake tool is not appropriate for processing general consumer epubs. Par for the course for amazon, though.
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