Generating a .pcap from Mikrotik - ERROR

Hello, I´m using a RB 1100 AH X2, I´m trying to generate a .pcap from the RB using these commands:

/tool sniffer set file-name=example
/tool sniffer set memory-limit=10000 file-limit=100000
/tool sniffer start
/tool sniffer packet print
/tool sniffer stop


The problem is that when I open with wireshark the file generated the mac address are all 00:00:00:00:00:00. The RB is being used as a switch, I have a bridge between the interfaces.

Is there a way I can see the MAC address?

Thanks in advance

do you have ports switched and master-port added to bridge?