Hello All,

Currently we are trying to deploy a physical setup:

1. Samsung S21 Ultra as UE
2. SRSRAN as gNB
3. free5gc as a core network

When we try to connect the UE we faced the following error 

![Screenshot from 2024-04-23 17-33-17](https://github.com/free5gc/free5gc-compose/assets/28990543/81476a01-e63c-4972-98ec-172bbd890ba7)


[WARN][AMF][Gmm] RequestedNssai[{Sst:1 Sd:}] is not supported by AMF
[ERRO][AMF][Gmm][amf_ue_ngap_id:RU:0,AU:1(3GPP)][supi:SUPI:imsi-001010000000001] Registration Status Update Error[: server no response]

It seems that the UE is sending Sst:1 and empty Sd but the core doesn't support Sd to be empty. Is there a workaround for this scenario ?   
 
Registration Status Update Error when connecting to a physical UE
This is a GitHub Issue
repo:free5gc
owner:free5gc
Title : Registration Status Update Error when connecting to a physical UE
Issue date:

--- start body ---
Hello All,

Currently we are trying to deploy a physical setup:

1. Samsung S21 Ultra as UE
2. SRSRAN as gNB
3. free5gc as a core network

When we try to connect the UE we faced the following error 

![Screenshot from 2024-04-23 17-33-17](https://github.com/free5gc/free5gc-compose/assets/28990543/81476a01-e63c-4972-98ec-172bbd890ba7)


[WARN][AMF][Gmm] RequestedNssai[{Sst:1 Sd:}] is not supported by AMF
[ERRO][AMF][Gmm][amf_ue_ngap_id:RU:0,AU:1(3GPP)][supi:SUPI:imsi-001010000000001] Registration Status Update Error[: server no response]

It seems that the UE is sending Sst:1 and empty Sd but the core doesn't support Sd to be empty. Is there a workaround for this scenario ?   
 
--- end body ---
