MV31 has two SIM interfaces: one for an external SIM card/slot, one for the internal eSIM on board

The two SIM interfaces can be switched back-and forwards via the AT command at^switch_slot

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[02-25 10:22:14:601] Send: ati

[02-25 10:22:14:780] Receive: 
Manufacturer: Thales
Model: MV31-W
Revision: T99W175.F0.1.0.0.9.GC.004  1  [Oct 21 2021 16:00:00]
SVN: 01
IMEI: 355979860166087
+GCAP: +CGSM
MPN: 27

OK

[02-25 10:22:33:587] Send: at^switch_slot?

[02-25 10:22:33:758] Receive: 
SIM2 ENABLE

OK

[02-25 10:22:38:226] Send: at^switch_slot=0

[02-25 10:22:38:361] Receive: 
OK

[02-25 10:22:40:617] Send: at^switch_slot?

[02-25 10:22:40:745] Receive: 
SIM1 ENABLE

OK

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Please use at^switch_slot=1 to enable the internal eSIM on board.

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On Microsoft WIN10/11,  follow the network setting for mobile data, in order to activate the eSIM profile

Hereby you can use the camera device to scan the QR code of your eSIM profile, which you have received from your MNO network provider

See screenshots attached