Yes, it is AX90. Following the thread indicated had no effect, as such I've sent an e-mail (as instructed on that thread) with all the information required. As there are a lot of attachments it's not...

I have a Archer 6600 and when I set the OpenVPN client (using protonvpn) the router keeps connecting, and do not enable VPN.

I've a AX6600 wich comes with OpenVPN client, however it keeps connecting forever. Same confir file uploaded to the router works on other clients.