@Heidi_Alp Thanks. I think the problem was with my WiFi name (Mark's WiFi Network). That was my old name and all was fine, but this router doesn't like apostrophes! I created a guest network with a...

Just replaced Apple Extreme router with XE75 mesh, Smart TV, iMac and phones work but not all my Google Home devices nor my Wyze cams nor my Wemo switches. So frustrated!