Your Reddit Vault seed phrase is accessible from Reddit on your mobile phone. To view it do the following:
- Open Reddit
- Tap on your avatar in the upper right corner of the screen
- Tap on the word "Vault" in the menu that opens
- Tap on the ... to the right of the word Vault
- Tap on Recovery Phrase
The screen that opens now will show you your Seed Phrase. You should write this down for safe keeping, do not share it with anyone and be cautious what you enter it into. DO NOT store it in a note on your phone or file on your computer. It is best to write it on a piece of paper, and to store that paper in a safe place.