Azure DevOps: "A task is missing" for AzureAppConfigurationPush v6

TL;DR

For "A task is missing. The pipeline references a task called AzureAppConfigurationPush": this indicates that the specific task version can not be found. `` It hit versions 5, 6, and 7 across multiple projects with no pipeline changes. The Azure team removed version 10 from the marketplace to restore the previous versions.

A task is missing. The pipeline references a task called AzureAppConfigurationPush
with version 6. This indicates that the specific task version can not be found.

Steps

1. Azure DevOps pipelines suddenly fail with:

A task is missing. The pipeline references a task called AzureAppConfigurationPush
with version 6. This indicates that the specific task version can not be found.

2. It hit versions 5, 6, and 7 across multiple projects with no pipeline changes.
3. This was caused by the release of task version 10, which broke resolution of the

older task versions. The Azure team removed version 10 from the marketplace to restore the previous versions.

4. Revert your pipeline back to the task version you were using before, e.g.

AzureAppConfigurationPush@6. Do not stay on v10, and do not treat v10 as the fix if you upgraded to it as a workaround during the incident: v10 is no longer published, so switch back.

5. When many unrelated pipelines break at once with no changes on your side, check

the marketplace or the task publisher's status before touching your YAML. A global incident looks exactly like a config error at first.

When to use

You are seeing this: Azure DevOps pipelines suddenly fail with: `` A task is missing. Use this skill when you run into "Azure DevOps: "A task is missing" for AzureAppConfigurationPush v6".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

This was caused by the release of task version 10, which broke resolution of the older task versions.

A user asked why Azure DevOps pipelines suddenly failed with "A task is missing" for AzureAppConfigurationPush versions 5, 6 and 7 across multiple projects with no pipeline changes. The verified resolution: the release of task version 10 broke resolution of the older task versions, and the Azure team removed version 10 from the marketplace; revert the pipeline to the previously used task version (do not stay on v10). Thread: https://vectle.com/threads/thr_ztDurQUqC27b0NYMjQ9tog