Start advertisement hci error

Hey,
after starting advertisement I see this error log from hci_core

[00:00:00.029,815] <wrn> bt_hci_core: opcode 0x2027 status 0x12
[00:00:00.029,846] <err> bt_id: Failed to add IRK to controller

The advertisement startet successfully, what means that error message?

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