barreaudb two things I don't understand:

You talk of a firewall and an AP, but only one port seems to be configured as a correct trunk config - for your use case, I tend to suspect at least two ports with proper trunks.
What is the idea of overloading the config with more than one VLAN ID as tagged? This is a guarantee for a nightmare. Sure, on a few switch platforms, the so called Asymmetric Switching was sometimes possible (with an additional control, as the switch must support that) - but most decent switches don't support this feature anymore. What does partially work in your case (on both switches when I get you right) is some kind of that.

Since no Netgear Plus Switches (new naming Easy Smart Managed Essential Switches) are supporting IPv4 "routing" - and I doubt you are keen to deal with complex ACL to create some firewall functionality - better handle the IP routing and firewall handling on some more sophisticated firewall system with some fancy customer friendlier controls.

Keep us posted how this works out.

Regards,

-Kurt.

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Tested firmware 2.5.1.8