@Kevin_Z I saw a new firmware update saying "Fixes SMS issue", but after updating SMS still doesn't work.

@Kevin_Z 

I confirm that my router is a MR600 V2 latest firmware: 1.3.0 0.9.1 v0001.0 Build 210208 Rel.61056n

I did several tesst with my 4G provider:

1. I tested a second sim card from same provider that my wife was using with a USB 4G Key --> error was different: 54 instead of 56
2. I explained to my provider the situation, and he explained to me that my 4G sim card was actived for a mobile and not for a 4G modem ... surprise do not know that it was possible that a sim works only in a mobile and not a modem
3. They reactivated my sim card --> instead of errocode 56, errorcode was 54 as with my wife sim card
4. I did some different tests with different numbers for SMS servers and target mobile numbers when I discover suddenly that I was able to send SMS because I changed the SMS server number format with international prefix : for France "+33" instead of using local prefix "0"

My conclusion on my experimentation with this provider: use 4G sim card for 4G modem and use international format (+XX) for sms server and target mobile numbers

Hope it will help someone

Regards

Stephane

@Kevin_Z  Is there any solution for this , or still its been worked upon , i am also facing the similar issue with JIO

@TP-Link @Kevin_Z  Is there any resolution for this issue is available now with 
Firmware Version: 
1.3.0 0.9.1 v0001.0 Build 210208 Rel.61056n
Hardware Version: 
Archer MR600 v2 00000001
and the firmware is up to date.

Attached are the logs for your quick reference.

Thanks,

@ManojMks @ShailendraSingh Their team said this:

"The MR600 doesn't support voice service, so VoLTE is not supported. Currently, we have only TL-MR6500v that supports VoLTE function."