Problem with Grandstream Gwn7000

Evening people

I have about 40 Grandstream GWN7000 routers that used to connect fine to ipfire/Openvpn since its built in.
Unfortunately recently due to updates on both IPF and grandstream’s side, I cannot get these connections to work again.
I used roadwarrior configs with route push options and client to client enabled and it worked perfectly. Now it seems that on IPF I get TLS authentication failed and on the grandstream side it seems to be related to local TUN Ip adress and Remote TUN IP address to some degree.(Although i am unsure as to what these should be since previously they would be auto assigned)

Has anyone else used these devices with IPfire recenlty?