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If you use your favorite search engine and search for terms like "nb iot roaming" you'll find plenty of other pages backing this.
I'd interpret this (2017) document from the GSMA in a way that it says "NB IoT specifations have been written very quickly, Roaming might be added later"
https://www.gsma.com/iot/wp-content/uploads/2017/08/CLP.28-v1.0.pdf
This ...
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