[Solved] Unity Build Automation encountered an error while validating your Build. Cannot start build

[CameronGoosen]

Had a perfectly working project and now I keep getting this error when I try to create new builds from Build History on the cloud build website, this is the entire log:

[error] Unity Build Automation encountered an error while validating your Build. Cannot start build - configured source control is unreachable:

[CameronGoosen]

Managed to fix this moronic software unlinking itself by going to:
Build Automation → Settings → Source Control → switch from Authenticate with Unity ID to Authenticate with Username and Password → then back Authenticate with Unity ID then save. See Image for UI example