Disconnected, reason 0x28

Hi!

I use SDK15.0 and s132_nrf52_6.0.0_softdevice

I use nRF52 in two modes- peripherial and central in one time.

When I use it like peripherial and have connect with antother nRF52 (central mode) with bonding mode, I try to connect smartphone (also central) to my nRF52 peripherial WO bonding and got an error Disconnected, reason 0x28. 

What possible reason?

Which configuration shoild I check?

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