I can't get BimlStudio 2018, 2019 configured to use TFS/TFVC

I've already submitted a support request, but thought I'd open things up here in this forum as well.

I am trying to configure BimlStudio to use TFS. I've followed a number of sets of instructions, but am not able to get it to work.

For version control, we are using TFVC as part of Azure DevOps.

I first tried setting things up in BimlStudio 2018 (64-bit) Build 5.0.63501.0
I have since upgraded to BimlStudio 2019 (32-bit) Build 5.0.64335.0 to see if there was some sort of fix between the two versions. I can't get either version to work.

In both instances (version 2018 and 2019) I set the path to tf.exe to the one we use with VS 2017 Professional.

That path is "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\tf.exe"

The Mist/BimlStudio project I am working, that I am trying to get configured with TFS, has an "SSDT path" setting of "C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe" (which also happens to have tf.exe located in that same path). This an older version of SSDT than we actively use, but with VS 2017, we can support multiple versions of SQL Server. I am targeting Sql Server, SSIS 2014.

Here's the only tfs info in the logging output. The characters "<Azure DevOps tfvc URL>" represent a replacement of our tfvc url. I removed it for privacy purposes.

12:27:40 PM 8bdebcd7-f338-4ede-9bbb-b9018bc907bf Start Tf Command info "C:\ProjectPath\BIML\MyProject.mst"
12:27:41 PM 25ca2a0e-d22e-4298-af6a-3d5626b0b079 Start Tf Error Output Path : C:\ProjectPath\BIML\MyProject.mst
12:27:41 PM ad9bac20-74ab-4a1d-b4db-bf65a5eda0b9 Start Tf Error Output Error : TF30063: You are not authorized to access <Azure DevOps tfvc URL>.
12:27:41 PM ad1cc12b-ff2e-4b7e-a31c-f91283c4bf1c Start Tf Command info "C:\ProjectPath\BIML"
12:27:41 PM c4c6c728-b394-4f17-affb-40d59ef1022b Start Tf Error Output Path : C:\ProjectPath\BIML
12:27:41 PM 840c2b3d-26bd-476f-8af5-02612c3b9599 Start Tf Error Output Error : TF30063: You are not authorized to access <Azure DevOps tfvc URL>.

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Here's my workspace details.

Could it be that because my workspace is private? I need it to be, due to the fact that I am running older versions of Visual Studio, namely 2008 R2 (i.e. to support my current work environment).