Has anyone successfully connected the XBee3 to AWS IOT using mqtt and micropython?

Yes. Take a look at the samples in this repository, which include a version of mqtt and ussl for XBee Cellular:

https://github.com/digidotcom/xbee-micropython/tree/master/samples/cellular/aws

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I haven’t (yet), but this video has been very helpful in understanding the process. https://www.youtube.com/watch?v=SlNVrZwaLNg

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