The ASIAIR WiFi Station Mode requires a connection between the ASIAIR and your home router (or extender).
It is not sufficient (nor necessary) that both of the ASIAIR and the home router are strong at your iPad. What is required for Station Mode is a strong signal between the ASIAIR and the router.
If you are on an ASIAIR Pro (instead of the better designed original ASIAIR plastic enclosure from Raspberry Pi), and the router is more than a couple of feet away from the ASIAIR, depending on orientation of the ASIAIR relative to your router (antenna directivity), and how many WiFi signals are in your neighborhood (signal to noise ratio of the WiFi signal), what you see is quite typical of what happens when you bury a microwave antenna inside a metal box (Faraday Cage). There are some orientations that won't work with a separation of just 5 feet, especially if you have a neighbor with a strong WiFi signal.
You may be able to site your ASIAIR Pro on a tripod leg (so its orientation does not change when you move the OTA) and change its orientation until it connects (and never move it again).
A better way is to not use WiFi (either Hotspot or Station Mode) on the ASIAIR at all (why use anything that is designed to fail). Connect the ASIAIR's LAN port to the LAN port of your router with a Cat5 cable, or to the LAN port of a wireless extender, with the extender wirelessly connected to your network.
If you have a spare USB port on your ASIAIR, you can also use a USB WiFi dongle like this one
https://www.amazon.com/Edimax-EW-7811Un-V2-Compatible-2-6-18-4-14/dp/B08F2ZNC6J
The above is only capable of 150 Mbps but better than nothing, and Raspbian (Raspberry Pi OS) has a prebuilt driver for the dongle above (ASIAIR worked when I tried; it is no secret that ASIAIR rides on top of Raspbian), but no driver for the faster dongles that I have on hand like the Edimax EP-AC1617. So, it is better to use something like the TP-Link travel router (which works off 5V -- and can even be powered off of one of ASIAIR's USB port) that is configured as an extender, and connecting the ASIAIR to it with an Ethernet cable.
Chen