@SmilingDad Hi, you may refer to R1D2's reply on this post: https://community.tp-link.com/en/business/forum/topic/172992

@teq Hi, have you tried to format the USB key? Here is a related post that seems problem solved. And it's pretty similar to the problem you are facing....

@lucasalves If you can connect to VPN server on phone using mobile data, then the problem should on the Client side [PROVIDER MODEM/ROUTER (192.168.0.1 LAN)] . Does this Router have a public WAN? Or...

@HansvSchoot Just my perspective: Unfortunately, that's how client to site works, static routing won't help. If you want to build a bidirectional communication, the only option on Controller is to...

@amegen Here are some related documents: How to set up site-to-site Auto IPsec VPN Tunnels on Omada Gateway in Controller Mode? How to Set up Site-to-Site Manual IPsec VPN Tunnels on Omada Gateway in...

@SethP Hi, what's the Router's model and firmware version? And how do you know there is no further updates? Did you see the WAN IP changed, but DDNS server still use the old WAN?