Mobile Printing & Cloud Printing

airprint has been used successfully for years. Nothing has changed in my network-- BUT i have changed one habit:I use hp instant ink & my printer usage is low.I have always kept ptr powered off until I need it,& this has worked well for me.Lately HP emails nag me incessantly to keep it turned on.When I do this,the next time i need to print, I get the no air printer error.Always, every single time. I've been able to restore service by the usual resets or by removing/re-adding the printer. Two days ago, though, out of the blue, the no air printer error appeared & cannot be cleared by any means that Ive tried, including: powering down/up router, printer, phone in that order (per Apple forum rec); removing/adding printer; checking for errors/status on network config page; updating phone to latest (14.7.1)

Luckily, I can still print wirelessly from my laptop, but dagnabbit, I like printing from my phone & I want that functionality back. I cannot fathom how this happened when the only change is that i started leaving printer powered on all the time.

I'd be thrilled & grateful for any clues leading me to a resolution. Thanks