Hello @Cherakkol ,

If you are unable to log in to the Tether App stably, please try the following steps:

1. Ensure your phone is connected to the main Wi-Fi network of your TP-Link device, not to the guest network or any other network.
2. Update the firmware of your TP-Link device to the latest version. You can do this by logging into the TP-Link web management interface and checking for updates.
3. Disable any VPN applications running on your phone.
4. Turn off mobile/cellular data on your phone to avoid connection conflicts.
5. Reboot your TP-Link device to refresh the connection.
6. Completely close the Tether app (remove it from the background) and then reopen it.
7. For iOS devices: Please make sure the "Local Network Access" permission is enabled for the Tether app. Go to Settings > Tether App > enable Local Network Access.
8. Ensure that no other devices are accessing the management page at the same time.