At the bottom of the ewelink app it offers “compatible mode” which is exactly how the tuya app and manual describe it, slow blink. I’ve tried that as well as it gets as far as asking me to connect to the device’s ap. I do that and relaunch ewelink but it never detects that I’m connected to a device it recognizes.

The diffuser is:

Smart Wifi Wireless Essential Oil Aromatherapy 400ml Ultrasonic Diffuser & Humidifier With Alexa & Google Home Phone App & Voice Control - Create Schedules - LED & Timer Settings https://www.amazon.com/dp/B07BF3MFH8/ref=cm_sw_r_cp_api_i_NQ-oFb0JEZGZH

The outlets are:

Smart Plug Works with Alexa Google Assistant for Voice Control, Teckin Mini Smart Outlet Wifi plug with Timer Function, No Hub Required, White FCC ETL Certified (4 pack) https://www.amazon.com/dp/B07CVH7WPD/ref=cm_sw_r_cp_api_i_AR-oFbFEAJ5ZG