Super fucking frustrating thing in Android: In Do Not Disturb mode, there's a special setting for "receive calls from: - your contacts - anyone". However also it's possible to add "Phone" and "Phone Services" to allowed apps. This won't do anything unless you ALSO set the separate flag. I've been having problems for 2 years with important calls not going through in "Do Not Disturb" mode despite having "Phone" on allowed apps. Only found the REAL switch today.
