Invalid voice mailbox after primary language change

I live in the US. Whenever I change my preferred language on my iPhone 13, IOS 17.3.1, (T-Mobile Prepaid) from English to a secondary language, my voice mailbox fails. Incoming calls not physically answered are sent off to my voice mailbox only to hear "Sorry, that mailbox is invalid." I have tried re-recording announcements, selecting default, and rebooting the phone, etc. but can't clear the error. Once I change my primary language back to English, the error self-corrects.