Found the solution. check the following video: https://www.youtube.com/watch?v=XoOT3_qmpyA In the mobile Tapo App enable "Third-Party Compatibility" switch in the "Third-Party Service" configuration...

@marekpro I've the same problem. My 5 Tapo P115 devices are not reachable from Home Assistent!!! Did you found a solution on this problem?