gistfile1.txt

2018-06-07T15:21:06.6052998Z ##[section]Starting: Push image
2018-06-07T15:21:06.6123753Z ==============================================================================
2018-06-07T15:21:06.6140246Z Task         : Docker
2018-06-07T15:21:06.6156363Z Description  : Build, tag, push, or run Docker images, or run a Docker command. Task can be used with Docker or Azure Container registry.
2018-06-07T15:21:06.6172754Z Version      : 0.3.12
2018-06-07T15:21:06.6188076Z Author       : Microsoft Corporation
2018-06-07T15:21:06.6204321Z Help         : [More Information](https://go.microsoft.com/fwlink/?linkid=848006)
2018-06-07T15:21:06.6220508Z ==============================================================================
2018-06-07T15:21:07.1468544Z [command]/usr/local/bin/docker push [company].azurecr.io/[app]:9389
2018-06-07T15:21:27.3224626Z The push refers to repository [[company].azurecr.io/[app]]
2018-06-07T15:21:32.4007152Z 5ae9fcdcd674: Preparing
2018-06-07T15:21:32.4022578Z 7a17d5221f0b: Preparing
2018-06-07T15:21:32.4038812Z 724fd69fe54d: Preparing
2018-06-07T15:21:32.4054549Z a6df8419d9c9: Preparing
2018-06-07T15:21:32.4070012Z 202ab1cb1515: Preparing
2018-06-07T15:21:32.4085331Z cd7100a72410: Preparing
2018-06-07T15:21:32.4100749Z cd7100a72410: Waiting
2018-06-07T15:21:48.8796672Z 5ae9fcdcd674: Layer already exists
2018-06-07T15:21:48.8851038Z a6df8419d9c9: Layer already exists
2018-06-07T15:21:48.8874683Z 7a17d5221f0b: Layer already exists
2018-06-07T15:21:48.9046116Z 202ab1cb1515: Layer already exists
2018-06-07T15:21:48.9061655Z 724fd69fe54d: Layer already exists
2018-06-07T15:21:59.3912261Z cd7100a72410: Layer already exists
2018-06-07T15:22:36.2995076Z 9389: digest: sha256:7992d3d72718c8... size: 1576
2018-06-07T15:22:36.3142246Z [command]/usr/local/bin/docker push [company].azurecr.io/[app]:latest
2018-06-07T15:22:56.3658665Z The push refers to repository [[company].azurecr.io/[app]]
2018-06-07T15:23:01.4133970Z 5ae9fcdcd674: Preparing
2018-06-07T15:23:01.4149469Z 7a17d5221f0b: Preparing
2018-06-07T15:23:01.4165146Z 724fd69fe54d: Preparing
2018-06-07T15:23:01.4180295Z a6df8419d9c9: Preparing
2018-06-07T15:23:01.4195822Z 202ab1cb1515: Preparing
2018-06-07T15:23:01.4211039Z cd7100a72410: Preparing
2018-06-07T15:23:01.4226670Z cd7100a72410: Waiting
2018-06-07T15:23:17.7810043Z a6df8419d9c9: Layer already exists
2018-06-07T15:23:17.7827253Z 7a17d5221f0b: Layer already exists
2018-06-07T15:23:17.7843927Z 202ab1cb1515: Layer already exists
2018-06-07T15:23:17.7860265Z 5ae9fcdcd674: Layer already exists
2018-06-07T15:23:17.7879786Z 724fd69fe54d: Layer already exists
2018-06-07T15:23:27.9349743Z cd7100a72410: Layer already exists
2018-06-07T15:23:43.7004721Z latest: digest: sha256:7992d3d72718c8... size: 1576
2018-06-07T15:23:43.8027536Z ##[section]Finishing: Push image

What you did to resolve this issue. I got same error, but it failed to push to ACR. Got below error.
Error: error parsing HTTP 403 response body: unexpected end of JSON input: ""

Honestly, I’m not sure anymore what even went wrong 😅
Do you have a link to the original issue?