Hey there,
Are you using Client VPN or Anyconnect to connect your devices to the MX105?
Client VPN uses L2TP and Anyconnect uses Cisco Proprietory VPN protocols (TLS/DTLS) so neither use IPSEC VPN.
I know that newer versions of Android (13+) no longer have L2TP support.
If your using Android 10 and still cant connect through ClientVPN then I would suggest going through this KB, then opening a ticket if your still having issues.
https://documentation.meraki.com/MX/Client_VPN/Guided_Client_VPN_Troubleshooting
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