Desktop Sync - Invalid AWS Region / Not a Valid DNS Name

Operating system

Windows

Joplin version

2.14.20

Desktop version info

Joplin 2.14.20 (prod, win32)

Sync Version: 3
Profile Version: 46
Keychain Supported: Yes

Revision: cfd98e3

Backup: 1.4.0

Sync target

S3

What issue do you have?

Windows desktop version fails to sync to S3 bucket on AWS, with error: "EndpointError: Invalid region: region was not a valid DNS name."
Region correctly coded to eu-west-2

Same settings work on iPhone, and the bucket has the data transferred/synced from the iPhone.

Looks like it was a network related issue (S3 DNS propogation?).

Added another device to the sync setup, which synced perfectly. Then attempted the sync on the desktop, which worked without any problems. Same network, same device, same settings (untouched from original post).