Undocumented condition: the password need to be made of 3 out of 4 groups: upper case, lower case, digits or signs. and have to be at least 8 letters/signs, ie. P@sswier4
As my ISP messed with the wan I have to made a dynamic DNS domain.no-ip.com account before it worked.
Be aware that if you use the same ISP on both ends the LAN IP range is properly the same ie. 192.168.1.??? so change one of them to another range maybe 192.168.11.???
which router model and firmware where you working with?
sorry for the late reply.
It was with a RV110W firmware with firmware version 188.8.131.52 and QuickVPN version 184.108.40.206. though it ended up that the ISP have messed with the wan so normal IP address xxx.yyy.zzz.xyz didn't work too, I have to make a domain.no-ip.com DynDNS account before it worked.