WRT1900AC: Unable to Access Router Remotely

Question

This may be a simple one, but I'm scratching my head over it.
I just picked up a 1900 for my personal use at home. I did a basic auto config (nothing fancy, just Plain Jane).
As a part of the config process, I associated the router to a Smart Access account that is different than the one that my Church's routers are assigned to.
For some unknown reason, I cannot access the router using the Smart app unless I am accessing the Internet through the 1900. If I access the Internet through my Verizon FiOS router, the Smart app tells me that my wireless router is offline.
I defaulted the 1900 and started from scratch using my desktop...again...associating the unit to the account. Again, no luck. 
I established a session with my smartphone and tried again with my tablet. Still no luck. 
Just to make sure that there was no outage,  I tried to access the Church routers....and was able to do so without any problems.
Is there an option that I am overlooking? I don't recall running into this situation when setting up the 6500s and 6900s.
I FEATURE 00
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Answer 1

Is the WRT1900AC router connected to the Verizon FiOS router? If yes, it is possible that the WRT1900AC is configured as an AP behind the FiOS router. This usually happens if routers are connected to another router or gateway (router/modem). More prone if the WRT1900AC was configured via auto-config since this type of networks are not the usual modem to router connection. If this is your setup, reset the WRT1900AC router again and manually configure the settings.
Cascading LAN to WAN:
1. Check and take note of the IP address of the ISP modem/router (FiOS router).
2. Connect a computer to the secondary router (desktop or laptop to one of the Ethernet ports of the second router). In your case, the Linksys WRT1900AC router is the secondary router.
3. Access the setup (Linksys Smart WiFi) page of the Linksys router.  Steps: http://kb.linksys.com/Linksys/ukp.aspx?pid=80&app=vw&vw=1&login=1&json=1&docid=bd520bcb07a6474596169...
4. Under Wireless, configure the wireless settings of the Linksys router and click on Apply button to save the changes. Steps: http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=8ce9e83bd3784001aee72da7f1ef48e8_Changing_the_basi...
5. Under Connectivity, click on Local Network tab > Router Details. Depends on what IP Address your modem/router (FiOS router) is using, make sure that the WRT1900AC router's IP is not on the same range and click on Apply button to save the changes. Example: FiOS router is 192.168.1.1, change WRT1900AC router to 192.168.2.1. Make sure the third octet is not the same.
6. Connect the ISP modem to the Internet port of the WRT1900AC router.
7. Power cycle your network. Unplug and re-plug the modem/router and router.
8. Connect your wireless devices to the Linksys router and check for internet access.