I can not see omnitik when connect to a swich.
but Wen I connect to different port I can see it
using Winbox
and when connect anny other port I can access the internet from the POE

If you are trying connecting via ether1 then try ether2 remove the default configuration and try ether1 again.

Regards,

PJD

Great! : it work
but an other thing is that,
When I connect it to the same swich wiht other Mikrotik divices, I am not able to view mikrotik divicies connected to the swich by Winbox
but I can connect since the mac adress is already in Winbox

check if routers you are trying to connect to have '/ip neighbor discovery' enabled on the port you are trying to connect.

Same thing
no change