Hello @Richard3234,

Thanks for contacting our community.

I noticed your previous feedback about some unexpected behaviors in your router after enabling the MLO Network. You've already contacted Local Support; could I know how things are going?

Please let me know if your network topology diagram is as follows:

ISP modem—Archer BE550 )))((( client devices

(Note: — stands for wired connection,)))((( stands for wireless connection )

It appears you will consistently be unable to access the Archer BE550 normally via the Tether App at night. Was the network functioning normally during this period?

If yes, have you tried to access it via the Web interface?

Since it occurs every night, it may be related to network settings, iOS background refresh behavior, or the router's scheduled tasks. Following these steps should help resolve the recurring login failures:
1. Ensure your iPhone is connected to the router's main Wi-Fi network, not the guest network or other networks.
2. Turn off any VPN applications and disable mobile/cellular data on your iPhone.
3. Enable "Local Network Access" for the Tether App on your iOS device (go to Settings > Privacy & Security > Local Network > Find Tether > enable Local Network Access).
4. Reboot the TP-Link router.
5. Force close the Tether App and reopen it.