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Cannot send dtmf to call: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Connected: No AT port available to run command'

Hi,

Im running modemmanager-1.18.6-r0 on postmarketOS on a poco f1 (snapdragon 845 device). I can call and text with no problems but when I try to send a dtmf tone to the call, modemmanager outputs:

Cannot send dtmf to call: 
'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Connected: No AT port available to run command'
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