"PLMN_NOT_ALLOWED" Error during eSIM registration to truephone on BL462E-CELL1,X-CUBECELLULAR v7.1.0

[Semyalo]

Hi,

I have checked through the inquiries and possible solutions on the ST community for eSIM registration issues on BL462E-CELL1.
However, none has worked for me.
https://community.st.com/t5/stm32-mcus-embedded-software/b-l462e-cell1-not-connecting-to-truphone/td-p/215965
https://community.st.com/t5/stm32-mcus-products/b-l462e-cell1-not-connecting-to-truphone-continued/td-p/166092

I'm in South Korea, and the error I get is;
"ATCModem:NetworkState (EPS) = NOT_REGISTERED_NOT_SEARCHING"
"AT%CEER?<CR> %CEER: 1,"NAS-EMM","ATTACH","REJECT",#11,PLMN_NOT_ALLOWED<CR><LF>"

I have attached the traces from the TeraTerm serial for more details.

- The eSIM is already activated on the Truphone IoT dashboard
- Executing "at at%nwoper?" command gives "TRUPHONE".
- South Korea is covered for LTE-M by Truephone (https://www.truphone.com/things/plans/coverage/?feature=LTE-M&addon=Asia )

The detected IMSI is "204080920719573" which corresponds to the Netherlands - KPN Mobile The Netherlands BV (https://www.numberingplans.com/?page=analysis&sub=imsinr )
I have traveled around to areas with more coverage by the main telecom networks here (SKT, KT, LGU+), but the IMSI hasn't changed, and the error persists.

Can someone check through the TeraTerm log attached, and offer some guidance on resolving the error?

@S.RA  @Ronan GABOU 

Your help is much appreciated.
Best regards.

[Semyalo · Accepted solution]

I resolved the error. With reference to the guidance from @Ronan GABOU (https://community.st.com/t5/stm32-mcus-products/b-l462e-cell1-unable-to-connect-to-network-or-registration-on/m-p/93137#M13091).

I checked this command “at at%getacfg=radiom.config.preferred_rat_list”, and the response was “none”.
Do not “trace off” to see the response.
I used the command “at at%setacfg=radiom.config.preferred_rat_list,"CATM"” to configure Cellular LTE CatM.
After resetting the board, eSIM registration was successful and I could evaluate the echo message & ping examples according to the binary firmware.
I have attached the tera term log for details.
The IMSI is still "204080920719573", but from the traces, it seems Truphone uses data roaming to establish the connection. If someone has a better explanation for this, it would be great to know.
Regards.