Thanks for the tests. After investigation, Tapo plugs and lights use a different communication protocol and security algorithms 
So no easy integration in Gladys without developing specifically for these devices.
If you want more details, there is a thread from our competitors about a P100 plug that also doesnât work: TP-Link Tapo P100 - #5 by iain - Hardware - Home Assistant Community
Tapo is a company that TP-Link bought with everything that comes with it (application, âŠ). There is an issue here to add support for Tapo devices to the library we use. But you will still need to enter your TP Link Cloud account to generate the keys necessary for local communicationâŠ