It’s a Bluetooth incompatibility. There’s something wrong with most scanners and how they support Bluetooth Low Energy.

I bought this scanner in 2020 and the one I bought then has worked fine across two different iOS phones.

Pay $5 for the Torque app.

There wasn't a proprietary app that I can recall, and +1 on Torque that's what I use

Usually they have a standard chip like an ELM327 clone (basically all the cheap ones) so you can use any app