Tag only one ethernet port with VLAN

RouterOS Beginner Basics
2

Your bridge lags vlan filtering:

/interface/bridge
set vlan-filtering=yes

Be aware that you could lock yourself out.
To prevend such a thing:

  • Use safe mode and check if it works
  • Remove one port from the bridge and use that as management port

Relevant documentation:
Using RouterOS to VLAN your network - RouterOS / Useful user articles - MikroTik community forum
The twelve Rules of Mikrotik Club - RouterOS / Beginner Basics - MikroTik community forum