Why did Siri say my message will send later?
Your phone could not reach Seayora at that moment. The message is in the app's outbox and sends on its own as soon as the connection is back — you do not need to do anything.
From the guide Siri, Shortcuts, Control Center & App Shortcuts.
Sending a message with Siri
- Your iPhone must be unlocked. Siri asks which conversation and what to say, and reads back where it is going.
- Siri says "Sent" only once Seayora has the message. With no signal it tells you the message will send when you are back online — it waits in the same outbox the app uses, and goes on its own.
- If Seayora refuses the message, Siri says it could not be sent and asks you to open the conversation to see why. It never reports a message as sent when nobody received it.
- It goes through exactly the same service as the Send button in the app, so everything that applies there — who you may message, blocking, the conversation's rules — applies here too.
Read the whole guide: Siri, Shortcuts, Control Center & App Shortcuts