Trigger another build exist in project in Azure Devops

Question

I have a repo name called A with its build pipeline as azure-pipelines.yml Then I have another repo called B with its build pipeline as

Answer 1

The error message looks like it's telling you it cannot find a pipeline with the name you specified, probably because, name means refers to the build numbering format in pipeline YAML e.g.

name: $(BuildID)

As @Roderick noted, the name of the pipeline should be what you see in the UI. From the main "Azure Pipelines" screen in your project. First click the "three dots" to get a submenu and then click "Rename/move". Example screenshot:

So now you should have the project name and pipeline names you need to update your YAML in pipeline B and it should work.