Hi @msimkin_1572,
Looking at the Azure DevOps documentation here, you should be able to generate a personal access token (PAT) and connect to it using a username as anything and a password as the PAT. In ProGet 5.2, only NuGet v2 API's are supported, so make sure to follow the instructions for connecting it to a NuGet v2 client. In ProGet 5.3 and later, we have added NuGet v3 support.
Could you give that a try?
Thanks,
Rich