Same here, the issue started on Wednesday 24th April. I’m on iPhone 15 Pro (iOS version 17.4.1) on Telstra 5G network, Trend Micro Mobile Security app version 11.2.1070. Everything works fine on wifi but not when using mobile data. It won’t let me turn off VPN in iPhone settings and I’ve tried resetting my network settings and nothing has resolved the issue. I’ve checked my phone data and still have plenty. I’m unable to use most of the apps on my phone if away from home / not on wifi.  It’s been 4 days and it’s extremely frustrating!!