Hi @EddieCz,
I suppose that you have installed the latest WiFi firmware (seeed-abd-firmware v2.0.3).
You can test which firmware is installed by calling rpc_system_version().
If the latest firmware is installed you have to include the rpcUnified and rpcWifi library. The atUnified and atWiFi libraries may not be included.
With regard to the Seeed_Arduino_mbedtls library it may be that you have to include the library from the dev branch (I’m not sure, may be that it was changed in the last days)