Weird, indeed… its a fresh install, right? That this file even exists. Well nevertheless, glad its working now for you. 
Yes, fresh install late on the 11th (Wednesday).
pacman -Qo volatile-storage.conf
error: No package owns volatile-storage.conf
Thing is I destroyed my logs trying to fix, it is dated:
stat volatile-storage.conf
File: volatile-storage.conf
Size: 75 Blocks: 8 IO Block: 4096 regular file
Device: 1dh/29d Inode: 2376 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2020-11-15 17:57:31.110046264 +0000
Modify: 2020-11-16 20:07:56.016816216 +0000
Change: 2020-11-16 20:07:56.016816216 +0000
Birth: 2020-11-11 23:34:17.655932452 +0000
The plot thickens - late on Wednesday.
I haven’t a spare pc, I wonder if it is a fault in the iso???
endeavouros-2020.09.20-x86_64.iso