Create an Input rule to allow Port 8291 from the internet.
Goto terminal on winbox and copy and paste:
/ip firewall filter add action=accept chain=input disabled=no dst-port=8291 protocol=tcp place-before=0
/ip firewall filter add action=accept chain=input disabled=no dst-port=8291 protocol=tcp
Then goto firewall and move port 8291 above the drop rules by dragging and dropping it.
or