We have an on-prem instance of DevOps Server 2020 hosting a Git repo as well as other ADO tools and I am doing some experimentation on a free DevOps Services instance to prevent any muddying of our existing Pipelines and Releases. I am currently stuck on the Pipeline trying to fetch a Git branch from our on-prem Git repo.
I've done quite a bit of digging already on the error code 128 with message "fatal: Authentication failed" and the DevOps Server IIS is configured with Anonymous Auth enabled and other auth options disabled. I am currently using the "Other Git" service connection option for the Pipeline source with our /tfs/ URL and provided the Pipeline with credentials to access the Git repo.
I have tested the very same URL using a git clone command from Git bash and it works fine, so I'm wondering why Pipelines is failing to make the connection, but I can do so fine from the command-line.