Tenda WAN IP: 192.168.0.1
have you tried to connect a laptop directly to the LAN port of the POE injector, open winbox, do you see the Mikrotik appear on neighbors section ?
this way you bypass Tenda and on the same Layer2 network as the Mikrotik, it should show up on neighbors section and you can connect to Mikrotik devices with its MAC address so you don’t even need correct IP.
No it didn’t work out
In neighbours section nothing is shown
in this case I would suggest to reset the Mikrotik and re-configure.
Can You tell how to reset it
A great thank you 
resetting did work.
THANKS
no problem. remember the change the password and make backup.