Let's try resetting your network settings on your device. Just a heads up, doing this will delete any previous Bluetooth devices that have been previously paired on that device.
1. From your home screen, swipe down from the top of your screen to open the Notification panel.
2. Touch the Settings icon.
3. Swipe to and touch General management.
4. Touch Reset.
5. Touch Reset network settings.
6. Touch RESET SETTINGS.
7. Again, touch RESET SETTINGS. Once you touch RESET SETTINGS, this action can't be undone.
8. Your Wi-Fi, Bluetooth, and other network settings will be reset, back to factory defaults.
In the Bluetooth menu, are the other devices you are wanting to connect to showing in available devices?
Are you wanting to connect to both at the same time using dual audio?
What type of devices are you trying to connect to?
Are they in pairing mode when trying to connect?
I would recommend trying to connect while in safe mode. You can put your phone into safe mode by following these steps.
Press and hold the power button until power off, restart, and emergency mode show on the screen
Tap and hold on the power off option until it changes to safe mode, then tap on safe mode
The phone will then reboot into safe mode. You will be able to check that it is by a grey transparent box in the bottom left of the screen that says safe mode.
Are your devices by any chance connected to another device, when you are trying to pair them with your device?