RBR50 Orbi Guest Password Doesn't Work

Hi: I set a guest password for my RBR50 Orbi Router -- using Orbi app on iPhone and also from the web admin page.  But, whenever I try to login to it via phone or computer, it says "incorrect password."  I've confirmed I'm using the correct one (that includes a cap letter, three numbers and two punctuation marks).  I changed the Guest WiFi Settings security method from WPA2-Personal to WPA/WOA2-Personal and neither made a difference.  I also rebooted the router via the Orbi app. Any other suggestions?  Thanks!