Tradfri two gateways

Hello,

I have installed a second IKEA Tradfri gateway, because not all lamps can be controlled by one gateway, because the lamps are distributed over several floors.

The THING IKEAT gateway is online, but the associated lamps do not go online.
the last two lights (Things) always remain offline (sauna_lampe_1 and sauna_lampe_2).
any idear ?

here the item configuration

Dimmer Wohnz_Lampe_1_ColorTemperature   "Wohnzimmer IKEA Lampe 1 Farb Temperatur"  <light>	(gIkea, gTradfri, gEG_Wohnen, gLicht_EG)  { channel="tradfri:0210:gwb8d7af2bab2b:65537:color_temperature" }
Color  Wohnz_Lampe_1_ColorLight			"Wohnzimmer IKEA Lampe 1 Farbe"			   <light>	(gIkea, gTradfri, gEG_Wohnen, gLicht_EG)  { channel="tradfri:0210:gwb8d7af2bab2b:65537:color" }

Dimmer Wohnz_Lampe_2_ColorTemperature   "Wohnzimmer IKEA Lampe 2 Farb Temperatur"  <light>	(gIkea, gTradfri, gEG_Wohnen, gLicht_EG)  { channel="tradfri_0210:gwb8d7af2bab2b:65538:color_temperature" }
Color  Wohnz_Lampe_2_ColorLight			"Wohnzimmer IKEA Lampe 2 Farbe"			   <light>	(gIkea, gTradfri, gEG_Wohnen, gLicht_EG)  { channel="tradfri_0210:gwb8d7af2bab2b:65538:color" }

Dimmer Linus_Lampe_ColorTemperature     "Linus IKEA Lampe Farb Temperatur"  	   <light>	(gIkea, gOG_Linus)                        { channel="tradfri:0210:gwb8d7af2bab2b:65539:color_temperature" }
Color  Linus_Lampe_ColorLight			"Linus IKEA Lampe Farbe"				   <light>	(gIkea, gOG_Linus)                        { channel="tradfri:0210:gwb8d7af2bab2b:65539:color" }

Dimmer Jula_Lampe_ColorTemperature      "Jula IKEA Lampe Farb Temperatur"  	       <light>	(gIkea, gOG_Jula)                         { channel="tradfri:0220:gwb8d7af2bab2b:65540:color_temperature" }
Dimmer Jula_Lampe_Brightness			"Jula IKEA Lampe Helligkeit"			   <light>	(gIkea, gOG_Jula)                         { channel="tradfri:0220:gwb8d7af2bab2b:65540:color" }

Dimmer Sauna_Lampe_1_ColorTemperature   "Sauna IKEA Lampe 1 Farb Temperatur"       <light>	(gIkea, gTradfri, gKG_Sauna, gLicht_KG)   { channel="tradfri:0210:gwd44da43a952d:65537:color_temperature" }
Color  Sauna_Lampe_1_ColorLight			"Sauna IKEA Lampe 1 Farbe"			       <light>	(gIkea, gTradfri, gKG_Sauna, gLicht_KG)   { channel="tradfri:0210:gwd44da43a952d:65537:color" }

Dimmer Sauna_Lampe_2_ColorTemperature   "Sauna IKEA Lampe 2 Farb Temperatur"       <light>	(gIkea, gTradfri, gKG_Sauna, gLicht_KG)   { channel="tradfri_0210:gwd44da43a952d:65538:color_temperature" }
Color  Sauna_Lampe_2_ColorLight			"Sauna IKEA Lampe 2 Farbe"			       <light>	(gIkea, gTradfri, gKG_Sauna, gLicht_KG)   { channel="tradfri_0210:gwd44da43a952d:65538:color" }

You could also use the powersockets as range extender, they have only be in range to the origij gateway and the lamps must be in range to the sockets