@nzben ok, so what are the VLAN settings of the Fritzbox ports? Screen dump?

@JoaoPTaveira Google is your friend.... https://www.tp-link.com/no/support/faq/3114/

@nzben I think a packet capture from a port of the unmanaged switch is really needed to understand what is going on once the controller provisions the APs. You would be looking to see if packets...

@nzben I think if you Disable VLAN here (red arrow below, you should be ok). You may want to power cycle the APs after making this change. Note the warning about meshing without using different VLANs...

@nzben I wonder if you have maybe enabled VLAN tagging of the SSID traffic, and your unmanaged switch isn't configured to untag appropriately. Are you able to do a Wireshark capture?

@David_89 Confirmed. You can read the approx voltage from the PSU feeding the SG1008. Also, the 13W figure is a max...they will typically idle in the 3-5W range.