100% fix for me and my WP-4530 was to go into Access Control under the SSID you are connecting to (mine is a MR33, only one SSID) and set the "Minimum bitrate" to either 1 or 2 for max compatibility. I played with this, and anything higher with this particular printer will not connect. Even after updating the firmware to the latest of around May 2018, still cannot move the min bitrate higher than 2. Must be cheaper hardware with limitations, wireless band is n. Prior to this I did the factory defaults and various manual/auto IP configurations, but nothing worked until I changed the min bitrate.
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