Ok so we purchased the Archer NX200 (with an external antenna) for stable internet connection (over 4g/5g) which now, with an external antenna, actually works so the "office room" is now covered if they connect with wifi. So internet works fine on the NX200, it will connect (using external antenna) so that part is fine.

However anything connected to the TL-R480T+ will not get trough and reach internet. So I tried switching lan ports (another TP-link MR200 modem) which works fine over TL-R480T+, before i couldnt even get any ip on the NX200 modem, now after i switched from WAN1 port to WAN2/LAN port on the TL-R480T+ it will get IP adress on the TL-480T+ and show up as a secondary WAN. But when i try to route internet traffic trough it, it stops.

(summary: So first it was routed from WAN1 on TL-R480T+ to WAN/LAN port on the modem. Now its from WAN2 on TL-R480T+ to WAN/LAN port on modem. First it got no separate IP on TL-480T+ at all, now i atleast get an IP, but no internet traffic.)

The two other "pure" LAN ports on NX200 have 2 NAS connected to it which i want "out" of the internal network for security reasons.

I just dont get whats blocking internet access here over my NX200 modem. There only thing i can think of is maybe theres some setting im missing here regarding, possibly related to the NX200 and the WAN/LAN port. Am i on to something? What else could there be?