What causes cdk bootstrap to hang?

I am trying to use the cdk bootstrap command.

>$env:CDK_NEW_BOOTSTRAP=1
>npx cdk bootstrap --cloudformation-execution-policies arn:aws:iam::aws:policy/AdministratorAccess aws://1234.../us-east-1

I get the output:

CDK_NEW_BOOTSTRAP set, using new-style bootstrapping.
Bootstrapping environment aws://1234.../us-east-1...

I just hangs at this point. On one attempt I came back more than an hour later and it was still stuck. An s3 bucket with the prefix cdk did show up but has no files.

I've attempted to run it a few times but it's always the same.

What can cause it to get stuck this way?

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