During a very very long phone call with your HQ the second week of May we have already tested in many configuration setup. Also with DHCPv4 in passthrough enabled. Now I test again after you post, with latest TRB501_R_00.07.23.7.
I only loose time (as usual); it still doesn’t work. In the rare case its take the public IP (P2P or auto), it doesn’t survive to next reboot and you always have to factory reset if you want to reach again the WEBui access on the local lan you left on a local internal address like 192.168.2.1.
After setting passthroung Ethernet remains OFF (electrically logic down) and IP become 169.254.x.x is on device connected.
After analysing your troubleshoot file, it seems that you have enabled Disable DHCPv4 .
Could you please try this configuration to see if it helps: turn off Disable DHCPv4 and enter MAC of device in LAN to which you want to get mobile public ip as shown in screenshot?