Ragnor: Here's where I think you need to be going (dhcp client on the vlan, no vlan in the bridge), example (port 1 for wan):
# vlan
/interface vlan add name=vlan1 vlan-id=10 interface=ether1
# dhcp client
/ip dhcp-client add interface=vlan1 disabled=no
# bridge
/interface bridge add name=bridge1
/interface bridge port add interface=ether2 bridge=bridge1
.. etc
That's a setup for using a Mikrotik as a bridge/switch to tag traffic - such as when you want to use a router that doesn't support 802.1p tagging on a UFB connection that requires a VLAN tag.
It's not the type of setup you'd use when using the Mikrotik as a router.