I have smart devices (light bulb and smart plug) but it doesn't want to connect to my internet ...

I have smart devices (light bulb and smart plug) but it doesn't want to connect to my internet. I contacted the smart devices company and they gave me steps to check (like the 2.4ghz ...) I did everything but they still won't connect... the same devices connected with no problem before I moved out (2 weeks ago) with the Videotron old router. I don't know what to do... the devices recognize the network but don't connect.

thank you