I am wondering if switching the device identity in Aurora effectively force stopped / restarted Aurora and that was what is needed. If you find in the future that you can’t find an app, or if you find it but when you go to its detail it isn’t available for install, give a try to force stop Aurora and re-launch to see if it will then list.
I haven’t sorted out the trigger causing this block, if it is at the Aurora level, at the iodé blocker level, or maybe at the microG level where there is something that gets out of sync and needs a restart of the Aurora store, but for me that will (usually) clear it up.