Access the TP-Link router's web interface using a web browser. You usually do this by typing the router's IP address (often something like 192.168.0.1 or 192.168.1.1) in the address bar.
Log in with the router's username and password.
Check the WAN settings to ensure that the router is set to obtain an IP address automatically (DHCP). If you've tried entering a static IP or other settings, revert them to default for now.

  @Pikajenn 

I actually connected an AX55, aka ax3000 to a Telus T3200M last week. My friend is no techie at all, she still uses the default passord on her modem. Other than port forwarding a port so I could remote manage the router if needed I didn't have to change a thing. I believe I seen setting to use the T3200M as an access point but with the setup we had figured for her we just used it as a second router/network. 

So I don't believe it;s anything inherent in the Telus service or the T3200M. Perhaps as the previous reply stated perhaps there is something wrong with the settings on the T3200M. Have you changed anything from default? I assume the cable between the T3200M and the AX5400 is good?

I didn;t really have nything to add other than that but thought I'd chime in because I did set up a router to the same model modem last week.

Pikajenn wrote

 I have an Ethernet cable attached to the WAN of the modem to the WAN of the router but light stays red/orange. 

  @Pikajenn 

Unless you have gone in the settings of the T3200M and changed it from a rouiter to an access point, in which case you may have to clone MAC address perhaps, I'm not sure exactly but could look it up. But what I did was run from LAN on the T3200M to WAN on the AX5400. If you haven't made any changes to the T3200M settings that should work. If you have changed the function of the T3200M in it's settings to an access point you may have to change settings on your AX5400 as well.

Update: I googled it and there are results from Telus help website that say to either use port 1 or else go into the T3200M settings and enable bridge mode. I don't see any mention of cloneing MAC address and no mention of WAN port. 

So that's basically what I did with my friend's router. I used port 1 on the T3200M, the WAN port on the TP-Link router and didn't touch the settings on the T3200M