SFcX15BA my wifi modem/router says the asiair is connected with a strong signal
Just confirming: you have the AA+ set up in Station Mode and you can see the IP address the router has allocated to it?
When you start up the ASIAIR App - have you tried connecting to the ASIAIR by directly entering in the IP address that has been allocated to your AA+ by your router?
Are you running the latest version of the ASIAIR App (v2.1-10.74)?
What version of Android are you running? See here for minimum device requirements: https://bbs.astronomy-imaging-camera.com/d/14009-update-on-minimun-system-requirements-for-running-asiair
Are you able to try running the ASIAIR App on a computer? You need install BlueStacks 5 in order to do so (the ASIAIR App runs within BlueStacks).