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Hi,

for ICMP Ping to OPNsens WAN Interface try first this WAN Rule first:

Proto           Source                   Port    Destination                Port    Gateway    Schedule    Description   
IPv4 ICMP        *                           *              *                            *            *

Within this rule goto "Advanced Options (show/hide)" an check (enable) the "disable reply-to", you should now be able to ping the WAN Interface by itś IP from any other ISP IP. If this works try your special settings for Source, Destination, Gateway,...