How to see network clients behind WAN?

Question

Computer networks

Good afternoon people. There is such a network.
The main router (Mikrotik) has addressing in LAN 192.168.0.1/22 .
Another router (TENDA) was plugged into the LAN, into the WAN port. We set up a static IP address (an address from the Mikrotik network (192.168.0.33). TENDA issues addresses of the form 192.168.6.1/24 to its LAN. Clients are plugged into
local ports, everything works on the Internet.
You need to see the clients of the Mikrotik network (192.168.0.0) from networks 192.168.6.0
We write the route on TENDA

Destination network Gateway
192.168.0.0 255.255.252.0 192.168.6.1

The rule works and we see the network 192.168.0.0 from the computers of the network 192.168.6.0
Now we need to see the network of the TENDA locale (192.168.6.0) from the Mikrotik locale (192.168.6.0)
On Mikrotik, add the rule to the Routes List

Dst. Address Gateway
192.168.6.0/24 192.168.0.33 (IP address of TENDA in the Mikrotik network)

But the network 192.168.6.0/24 is not even visible from Mikrotik.
Tell me what's wrong?
Thanks

Answer 1

on the trend to disable dhcp, include the incoming cable in any lan port.
get such a switch for yourself, the network will be one.

Answer 2

not so that on tenda you have NAT enabled for packets from 192.168.6.0/24 to 192.168.0.0/24. it needs to be turned off.

Answer 3

You have a slightly strange network design. But the question in general is about classical routing.
And in order for one router to know where another (not its network) lives, it needs a static (or dynamic) route, and exactly the same mirror from a remote router.
Probably on Mikrotik you need to register like this:
PS
You don't need any NAT on TENDA, NAT only on Mikrotik.
Networks also do not need to be changed (someone advised in the comments) that's why they are gray.