Kasa Smart Plug Classic (model: hd34bx)

I just bought a new TP-Link (AX3000 - Archer AX50) WiFI router and now I can't get my plug to connect to the app.  I have 3 plugs.  2 of them are Smart Plug Minis and one is a Smart Plug Classic.  After I updated my Alexa to the new network, the Minis worked fine.  I didn't have to touch them and I still have full access to them in the app and through Alexa.  The Classic, however, will not sync. I've unplugged it, reset (hold power for 5 secs) and factory reset (hold power for 10 secs) and none of that worked.  I also tried plugging in the old WiFi router that it used to be connected to and that didn't help either. 

When I plug it in, it flashes blue continually.  If I hold the power button for 5 secs, it starts flashing red then blue and I can see a new wifi network called "Amazon ConfigureMe" pop up.  I try to sync through the app while I'm connected to my 2.4G network, but I it keeps failing.  I can connect directly to "Amazon ConfigureMe", but that doesn't help;  I get the same failure.

I should mention I tried changing the security between WPA2-PSK AES and TKIP and that didn't help.  I also tried on my guest network and that didn't help. I also tried turning on my broadband modem's 2.4G WiFi and that didn't work either.

Any help would be appreciated.