artifacts certificate signed by unknown authority error when downloading artifacts from coordinator

I have a pipeline that runs a pre-build stage that builds four VS projects in a single Lib:pre-build: job that saves the output directories as artifacts, approx 150MB. I am then running approx. 20 build jobs in a build stage that download these artifacts so they’re not re-built by those 20 solutions.

The pre-build jobs set the output directories as artifacts, the build jobs have dependencies: ["Lib:pre-build"] set to download just these artifacts.

I have two GitLab runners running on Windows, one in AWS and one on-premises. All the 20 build jobs are succeeding but taking too long as they are all getting errors downloading the 150MB artifacts from the previous stage:

Downloading artifacts for <edited>...
Runtime platform                                    arch=amd64 os=windows pid=9196 revision=8925d9a0 version=14.1.0
ERROR: Downloading artifacts from coordinator... error couldn't execute GET against<edit>/artifacts?direct_download=true: Get<edit>: x509: certificate signed by unknown authority  id=<edit> token=<edit>
WARNING: Retrying...                                error=invalid argument
Downloading artifacts from coordinator... ok        id=<edit> responseStatus=200 OK token=<edit>

This issue downloading artifacts is holding up some jobs by up to 10mins.

I can’t find any information on how or why I’d need to deal with (or certificates when registering or using a gitlab runner. It seems to me this is an issue with

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I have the exact same error. Did you manage to find something?