Online Subsystem IOS fails to load on remote build

Development Platform & Builds Mobile
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1

We’re doing remote builds for iOS on UE5.4.4 and build succeeds, but the Online Subsystem iOS module fails to load with this message:

UATHelper: Packaging (IOS): LogOnline: Warning: OSS: TryLoadSubsystemAndSetDefault: LoadSubsystemModule([IOS]) failed
PackagingResults: Warning: OSS: TryLoadSubsystemAndSetDefault: LoadSubsystemModule([IOS]) failed

What might we be missing? This is a Blueprint-only project and the module is ticked on the Plugins page.

Thanks!