CloudXRKit 6.2.0 fails locally with 0x800B1004 (NVST_R_INVALID_VALUE) on visionOS 26.5 / 27.0 — no network traffic emitted

Environment: cloudxr-framework 6.2.0 (latest release) + cloudxr-apple-generic-viewer (unmodified, manual-IP mode); Apple Vision Pro ×2 (visionOS 26.5 build 23O471, visionOS 27.0 beta 24M5306i); servers tested: CloudXR Runtime 6.2.1 on both Ubuntu 24.04 (RTX 5090, driver 580.159.03) and Windows 11 (RTX 5070 Laptop, driver 592.19).

Symptom: session.connect() with .local(ip:) fails in ~1.1s with Error Domain=NVIDIAStreamKit Code=2148208644 "0x800B1004" UserInfo={SessionNotificationType=51}. Bifrost log stops after nvbCreateClient/nvbSetHttpClient. Packet capture on the server confirms zero packets are ever sent — the failure is entirely client-local, before any network I/O.

Ruled out: server platform (identical on Linux & Windows servers), device (2 devices), OS version (26.5 & 27.0), Local Network permission (granted), ATS (LAN-exempt), network environment (office Wi-Fi & cellular hotspot), server reachability (port 48010 verified open).

Note: the same devices stream successfully via the visionOS 26.4 FoveatedStreaming system path against a Windows server (Runtime 6.2.1 + Stream Manager 6.1.0 + StreamingSession sample), so the device-side system stack is healthy. The public framework's docs/deployment targets still reference visionOS 2.4 / Xcode 16.4 — is a visionOS 26.x-compatible framework release planned? This is blocking Linux-server deployments (which per the LÖVR sample docs are supported with the native AVP client).

Secondary request: Stream Manager (client-auth/token issuance) is Windows-only, which also blocks the FoveatedStreaming path on Linux servers. A Linux Stream Manager build or a documented token-issuance API would unblock this.

Start with the unmodified cloudxr-apple-generic-viewer and its session.connect(.local(ip:)) entry point, then review the Bifrost log around nvbCreateClient and nvbSetHttpClient. Compare the client-local failure with the successful visionOS 26.4 FoveatedStreaming path; done means confirming framework compatibility or documenting a supported visionOS 26.x and Linux-server path.