Source Control Through ARM Template

Hi, I've been running into some issues while trying to build an ARM template which links a Sentinel instance to Azure DevOps using Microsoft.SecurityInsights/sourcecontrols. I've got it to the stage where it now seems to need authentication to access the private repo, outputting this error:  "The repoOAuthCode field is required." this isn't referenced in any of the docs from what I can see.

Any nudge in the right direction would be really appreciated.