Causes:
1. If Data saving is enabled, the hotspot cannot be enabled by default to save mobile data.
2. Temporary abnormalities in the phone system may cause this phenomenon.
Solutions:
1. Please turn off Data saving, then try again.
realme UI 2.0 & above versions: Settings > Search "Data saving" in the search bar > Data saving.
realme UI R & Go & S & T & U Edition: Settings > Network & internet > Data Saver.
2. It is recommended that you reset network settings, then restart the phone, and try again.
realme 2.0 & above versions: Settings > Search "Reset Network settings" in the search bar > Reset Network settings.
realme UI R & Go & S & T & U Edition: Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth.