RUT240 send SMS

I have a RUT240 router.
I have received text messages but am unable to send text messages.
I upgraded to the newest firmware on 02/01/2024.
I tested the SIM card using it on my personal cell phone and I can receive/send SMS messages from this device correctly. The network is Swisscom. I am on auto 4G with VOTLE.
I tried without VOLTE, in 3G only, 2G is no longer supported by Swisscom.
I have the impression that there is a conflict with RCS or multiSIM

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