Most likely, you have one of two common issues:
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If you can get the controller into the ‘awaiting Wi-Fi’ state (quadrant 2 blinking), but it remains in that state after attempting to set it up in the app, your phone is incompatible with the old firmware that the controller had when shipped. One workaround is to use e.g. a tablet with an older version of Android or iOS. Another is to use a laptop (easiest with a MAC); see
https://support.rachio.com/en_us/issues-connecting-to-new-model-iphoneipad-and-samsung-phonestablets-HJIBvLyFv -
If the controller advances to the third or fourth quadrant blinking, but doesn’t come on line, this is likely a router/firewall or Wi-Fi access point issue. A quick way to confirm this is to set up a second phone as a temporary mobile hotspot, and connect Rachio to that. If that succeeds, post details about the network environment – with luck a simple settings change will fix the problem.