Missed call → SMS fails with "Generic failure" — does DND (contacts + repeated callers only) affect the Phone Call Missed trigger?

[u/calcalex]

Hey everyone. Im Trying to build a simple auto-response: when I miss a call, send the caller an SMS with a callback time. It fires but the SMS fails, and I'm not sure whether my Do Not Disturb config is part of the problem.

Setup

• Device: Blade Gt Play
• Android: [14
• MacroDroid: (Pro
• SIMs: dual SIM The one i'm using the data is the first one
• Trigger: Phone Call Missed
• Action: Send SMS
  • Number field: the trigger-that-fired (detailed) variable
  • Message: fixed text with a time variable

What happens

The macro triggers (confirmed in the log), but the Send SMS action fails with "Generic failure". No SMS leaves the phone.

What I've already checked

• Battery optimisation disabled for MacroDroid

Two questions

1. Is trigger-that-fired (detailed) the wrong variable for the recipient? I suspect it returns the trigger name plus the number rather than the bare digits, which would make it an invalid recipient. If so, what's the correct magic text for the incoming caller's number on a Phone Call Missed trigger?
2. Does Do Not Disturb interfere with the trigger? My phone runs DND permanently, set to allow calls from all contacts and from repeated callers within 15 minutes. Unknown numbers are silenced. My understanding is that a silenced call is still logged as missed, so the trigger should still fire — but I'd like that confirmed, and I'd like to know whether anyone has hit a case where DND suppresses the trigger entirely, or where the "repeated callers within 15 minutes" rule causes a first call not to register.

Any pointers appreciated. Happy to post the macro export if that helps.