Unable to print from my iPhone and iPad

Yesterday I had no problem printing from my iPhone and iPad. Today it will not come up on either. Yet, my wife’s iPad and iPhone are still working fine. I have done all the suggested things I can find like turning everything of and on, doing restarts etc. my printer is air print compatible and does work with my wife’s equipment. Since it worked yesterday and I changed nothing I can’t understand why it doesn’t work today. Any suggestions would be appreciated.

[Re-Titled by Moderator]