@ukmartian Archer C50 supports AP mode natively since HW v4 - AP mode (case 1) If yours is below HW v4 you can use AP mode (case 2). Here's how to determine the HW version of your device. In either...

@ZdraO This is by TP-Link's design. My understanding of the logic behind this is: If the router has an Internet connection, when login with TP-Link ID the DDNS information is extracted from the...

@Kiran.shendage Check if your device is compatible with Tether app. If it's compatible here's a guide for using it. Tether FAQ.

@ZdraO Try login with the TP-Link ID instead administrator account to see if any difference in the DDNS section:

@ZdraO After router restart are you login with the TP-Link ID or with the local admin account ? Here's a guide for configuring the TP-Link DDNS service:

@HumarMorenoB Follow this thread to troubleshoot your issue - [Troubleshooting] Speed limit to 100 Mbps