First , follow the documentation steps here: https://docs.coronalabs.com/guide/distribution/liveBuild/index.html
If nothing from what is above works then you got two more options:
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Remove the build file from your PC and app from your Phone then restart both to start over.
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MAKE SURE YOUR ANTIVIRUS OR OS FIREWALL IS OFF!!!
If nothing of these options worked for you then, well contact Corona’s team.
See you 