HRESULT 0x8054820D (E_MBN_NOT_REGISTERED): meaning and diagnosis

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The mobile-broadband device is not registered with a cellular network.

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E_MBN_INVALID_CACHE	E_MBN_PROVIDERS_NOT_FOUND

E_MBN_NOT_REGISTERED

E_MBN_NOT_REGISTERED is a Windows Mobile Broadband (MBN) HRESULT. It indicates that the modem is not registered to a network and therefore cannot perform the requested service operation.

What to check

Check radio power, coverage, carrier availability, roaming policy, and SIM or subscription status.
Wait for registration completion after a network scan or a change of location before attempting data or SMS operations.
Collect modem registration details and carrier diagnostics rather than treating this as an application authentication error.

Microsoft: MBN error codes

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