I had similar problems with HP Envy Inspire 7200e all-in-one. My system is Ubuntu 20.04 LTS with current updates.
Having set up Wifi the printer side worked fine and ran the usual tests, but SimpleScanner kept saying there were no scanners available.
This how I finally got it to work:
First I tried re-installing the current (3.22.2) hplip. Forget it. HPlip claims that the 7200e is supported from 3.21.10, but it was looking for files like python-pyqt5 which it couldn't find because it isn't part of the standard downloads under 20.04: Synaptic's Package Manager supplies python3-pyqt5. As a result it wouldn't install. Deleted HPlip.
I also purged ippusbxd, setting the 7200 up via USB as HP suggested didn't work.
Instead, following advice at https://ubuntuforums.org/archive/index.php/t-2452452.html I ran a barrage of tests, which helped some but didn't get things working. I would recommend that you read that through (it's a bit confusing in parts) because there are some good hints.
In the end I re-installed sane and added sane-airscan and replaced ippusbxd with ipp-usb (from the snap store) as the link recommends, BUT I had to purge Simple scanner and re-install it (as Document Scanner) from snapd.
Once re-installed the system found the scanner and it both scans and prints as you would expect it to.
Hope this helps!