DTMF issues with one number

I have one number that will not accept any of the DTMF options, I tried info, auto, rfc2833 and none work for incoming. I called the sip provider and they said they cannot reproduce the issue. No matter what carrier you come from, it doesn’t work. I know I can enable DTMF for the logs, but I’m not sure what to look for as an example.

Os DTMF working with other DID’s on the same PBX ?
Does DTMF work when you call the IVR internally?

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