iOS distribution provisioning and distribution issue

Hitting an infuriating issue when attempting to build a Unity iOS project via Dev Ops.

Setup:
* Unity 2020 (latest LTS)
* iOS Unity project
* Distribution profile created and assigned in the iOS player settings

The Unity project and resultant xCode project appear to build fine, but it all falls apart when you attempt to Archive the project to create the IPA file using the command line:

xcodebuild -exportArchive -archivePath './myProject.xcarchive' -exportPath 'Build' -exportOptionsPlist '$info.plist' -IDEBuildOperationMaxNumberOfConcurrentCompileTasks=8 -jobs 16 -allowProvisioningUpdates -allowProvisioningDeviceRegistration

But when the Archive runs, we are met with the following error:

error: exportArchive: "myapp.app" requires a provisioning profile.

However, this is all configured in Unity, I've downloaded and imported the provisioning file in the iOS Player settings for distribution.