My cameras are Tapo C510W 2K Outdoor Cameras. 
My internet provider had to send me a new modem today with new password. My cameras worked before on the old modem but now they are offline. My 4 cameras are all fixed  outdoor  on very high level which requires someone to use a tall ladder. I rebooted the cameras by switching my electric off and hoped that I could connect to the Tapo_cam network but my phone couldn't detect it! 
How could I get them to work with my new modem? 

Please HELP! 

Thank you