Chateau LTE6 don't receive SMS but send and internet is ok

Hi
I have a Chateau LTE6 (S53UG+5HaxD2HaxD&FG621-EA), I want to use both internet and sms of simcard, now internet is OK, and I can send SMS without problem. but it don’t receive SMS, but when I disable and enable LTE interface, all waiting SMSs will be received. where is problem !?
someone says both internet and sms can not be used together on this model, is that right ???
I tested other simcard with other service provider but nothing changed
I don’t need send SMS, I need Receiving SMS to run some script from remote place and …
Router OS version: 7.15.3
thanks any help

https://help.mikrotik.com/docs/display/ROS/SMS#SMS-Receiving

I have similar issues with hAP ax lite LTE6 (L41G-2axD&FG621-EA), I think it has the same FG621-EA LTE chipset (16121.1034.00.01.01.04).
I created a script that disables sms receiving, waits few seconds and re-enable it.
This way it polls the messages from the module. It is not 100% working, once I still had to reboot to get the messages.
Also the mobile provider may periodically drop the connection to force ip renewal. Once my device did not reconnect after this, so I also created a script that disables, waits, enables the lte interface if it is not connected for a wile.

Maybe next RouterOs release will help with this:
7.16rc1 has an option https://mikrotik.com/download/changelogs

" sms - added polling setting so that RouterOS itself checks SMS instead of relying on URC messages;"

And the manual already mentions it https://help.mikrotik.com/docs/display/ROS/SMS

Receiving
polling (yes | no; Default: no) checking the modem for new SMS every 10s, instead of updating the inbox only after receiving the command from the modem. Available starting from v7.16