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To troubleshoot what has happened, you need to go to the cloudformation stack, look at Events tab and trace the first failed event that has triggered the rollback. There might be a number of reasons why a stack might fail :
- there is an outdated reference in the stack
- you do not have permissions or access to certain resources mentioned in the stack
- deployment might have failed by incident for one of the resources
- etc.
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[Update] I have run the same stack in us-east-1 with success and using these parameters. Please note that I used t3 instances for test. So the stack does not have any issues in deployment. You need to look at the Events tab and trace the error.
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