Voicemail stopped working after call forwarding was turned on

Has anyone had voicemail and call forwarding suddenly stop working together? I turned call forwarding on last night because I was going to be out of signal, and now people say it rings out once then drops. Voicemail never picks up either. I’ve tried switching the phone off/on and checking the Nexora app but it’s all a bit unclear. I’m on a mobile plan, if that makes any difference.