MikroTik RouterOS v2.9 Reference Manual page 564

Notes
It is highly recommended to upgrade DirectX runtime libraries to version
and Windows Messenger to version
work properly.
Example
We have masquerading already enabled on our router:
[admin@MikroTik] ip upnp interfaces> /ip firewall src-nat print
Flags: X - disabled, I - invalid, D - dynamic
0 src-address=0.0.0.0/0:0-65535 dst-address=0.0.0.0/0:0-65535
out-interface=ether1 protocol=all icmp-options=any:any flow=""
connection="" content="" limit-count=0 limit-burst=0 limit-time=0s
action=masquerade to-src-address=0.0.0.0 to-src-port=0-65535
[admin@MikroTik] ip upnp interfaces>
Now all we have to do is to add interfaces and enable UPnP:
[admin@MikroTik] ip upnp interfaces> add interface=ether1 type=external
[admin@MikroTik] ip upnp interfaces> add interface=ether2 type=internal
[admin@MikroTik] ip upnp interfaces> print
Flags: X - disabled
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Windows Messenger 5.0
DirectX 9.0c
or higher in order to get UPnP to
or higher