hAP ac^2 | Clients on Switch-Port do not get IP via DHCP

No worries, one doesnt have to delete the whole wireless profile just the sensitive bits - but not usually germane to most issues so not a problem.

In summary you need to read this document as your configuration vis-a-vis vlans is a mess, and pay special attention to section ACCESS POINT after you have read through it to understand the mechanics valid for all setups!!
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1

(1) Your problem is defining VLANS in the wrong space. They have no business being identified in the wireless settings.
Vlans needed to be identified in the CAPAC, and associated to the bridge interface.
The bridge ports and bridge vlans identify the interfaces (ports) that are associated with the vlans for ingress and egress (remember bridge ports included wired ports and wlan interfaces).


/interface wireless
set [ find default-name=wlan1 ] band=2ghz-g/n country=austria disabled=no frequency=auto installation=indoor l2mtu=1598 mode=ap-bridge name=hAP3-2GHz ssid=MikroTik3-2GHz wps-mode=disabled
set [ find default-name=wlan2 ] band=5ghz-a/n/ac channel-width=20/40/80mhz-Ceee country=austria disabled=no frequency=auto installation=indoor l2mtu=1598 mode=ap-bridge name=hAP3-5GHz ssid=MikroTik3-5GHz wps-mode=disabled
add disabled=no l2mtu=1598 mac-address=4A:8F:5A:24:7A:12 master-interface=hAP3-2GHz name=vAP3-10-KNX2 ssid=WBC-KNX2 vlan-id=10 vlan-mode=use-tag wps-mode=disabled
add disabled=no l2mtu=1598 mac-address=4A:8F:5A:24:7A:15 master-interface=hAP3-5GHz name=vAP3-10-KNX5 ssid=WBC-KNX5 vlan-id=10 vlan-mode=use-tag wps-mode=disabled
add l2mtu=1598 mac-address=4A:8F:5A:24:7A:22 master-interface=hAP3-2GHz name=vAP3-20-HIFI2 ssid=WBC-HiFi2 vlan-id=20 vlan-mode=use-tag wps-mode=disabled
add l2mtu=1598 mac-address=4A:8F:5A:24:7A:25 master-interface=hAP3-5GHz name=vAP3-20-HIFI5 ssid=WBC-HiFi5 vlan-id=20 vlan-mode=use-tag

ETC…

(2) I also dont think its wise to have so many virtual Access Points, I am not sure where I read this somewhere but I think the practical limit was closer to 4 or 6???\

(3) What subnet are the master wlans1 and 2 running on? If they are also using vlan90 then that needs to be identified on bridge ports via PVID etc.
(4) You have not identified any of the VLANS and what interface they are attached to, in this case the bridge!!!
(5) Finally you have the wrong config for bridge vlans, all the wlan interfaces/ports that are feeding non-smart devices (aka untagged) NEED to be UNTAGGED here!!!