I don’t have managed networks on my iOS device, so I cannot test it, but https://discussions.apple.com/thread/254228630 says:

> I spoke to Apple support today and they helped me. First I had to reset Network settings, then at bottom of Wifi settings page, I had to make sure that ‘Ask to join networks’ is set at ‘Ask’, and ‘Auto-Join Hotspot’ is set at ‘Ask to join’

> The hotspot still shows up in my networks, but now it never joins