One caller cannot leave voicemail
Recently I started having problems with one person (my husband) who gets no voice mail message from my phone & cannot leave a message to my phone. He has Great Call using a Flip phone & I have AT&T Prepaid on IPhone 11. We can call & talk to each other. It is just the voicemail that is the problem. He can call, hear & leave messages for other providers (Spectrum, T-mobile, AT&T Postpaid). I can receive voicemails from others (US Cellular, T-mobile, Verizon). AT-T Customer Support couldn’t figure it out. Any trouble shooting ideas?