Can't connect to my dell mfp h815dw printer

If your printer is already connected to your Wi-Fi network, it's generally recommended to disable Wi-Fi Direct unless you specifically need it for direct printing to mobile devices or other devices without access to your network. Disable this to see if it will resolve the issue.

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Had this issue before try restarting both the printer and your router. Also, make sure your phone/computer is on the same Wi-Fi band (2.4GHz vs 5GHz). Disabling and re-enabling Wi-Fi Direct on the printer helped me too.