Hello  @AlekoB ,

Welcome to our community.

TP-Link routers are not designed to work with multiple storage devices connected through USB hubs or multi-bay enclosures. The USB ports on TP-Link routers are typically intended for connecting storage devices directly—such as a single USB flash drive or USB hard drive—rather than for connecting multiple drives through a hub.

Recommended solutions:
1. Connect drives directly: Try connecting each HDD directly to the router's USB port one at a time to verify they work individually.
2. Use one drive at a time: If you need to use multiple drives, you may need to switch between them by connecting only one at a time.
3. Consider alternative storage: If you need simultaneous access to multiple drives, consider using a NAS (Network Attached Storage) device on your network instead, which is specifically designed for multi-drive setups.

In addition, was your previous Archer AX11000 able to detect three drives simultaneously? Do you have any screenshots? Were you using the same drives?