ASUS RT-AX88U wifi router VPN Client issue

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New Around Here
I have a ASUS RT-AX88U wifi router with firmware version

The current firmware version is When I try to upgrade from to any new firmware I have an issue with VPN client.

When I add an Open VPN client, in my router, the internet status shows disconnected on my router configuration page as well as a red light on the router. But I can still access external websites without any issue. Also when I do IP address check, DNS check it is correctly showing as per the VPN connection.

As soon as I deactivate the VPN client everything is back to normal. I tried different countries, but the same issue. I have downloaded the VPN configuration files for ASUS Routers (Including Merlin). Also copied the username and password on to the VPN configuration page in the router.

Please see the attached pic.

Is this a glitch with VPN or with ASUS firmware? When I contacted ASUS support they are telling that everything fine at their end. Thanks...

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