What does HRESULT 0x80548219 (E_MBN_DEFAULT_PROFILE_EXIST) mean?

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A default Mobile Broadband connection profile already exists for the device.

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E_MBN_INVALID_PROFILE	E_MBN_SMS_ENCODING_NOT_SUPPORTED

E_MBN_DEFAULT_PROFILE_EXIST

E_MBN_DEFAULT_PROFILE_EXIST is a Windows Mobile Broadband (MBN) HRESULT. It indicates that the requested profile creation would set a default profile when the device already has one.

What to check for E_MBN_DEFAULT_PROFILE_EXIST

Enumerate existing connection profiles and identify the current default before creating another profile.
Update the intended profile or change the default only through the supported profile-management workflow.
Avoid repeatedly importing the same default profile during provisioning or application startup.

Microsoft: CreateConnectionProfile return values

Diagnostic discriminator: Enumerate connection profiles and identify the existing default before creating another. The conflict is the one-default-profile rule, not an invalid APN or unavailable provider.

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