Try rebooting your WiFi router to see if that fixes any connection issue.

To run a quick diagnostic test for your printer for this type of printing, go ahead and install the WePrint printer sharing software on your Mac or PC.
You can download WePrint here https://esz.nz/wp.

Make sure you have WePrint: showing in the Server field on the Print screen for this test, or tap on the Choose button to select it. WePrint will also allow you to print over 3G/4G.