Hello BoneyJoanie,
For difficulties with pairing your Fitbit Versa you'll want to take the steps below:
1. Make sure that your Bluetooth accessory and iOS or iPadOS device are close to each other.
2. Turn your Bluetooth accessory off and back on again.
3. Make sure that your Bluetooth accessory is on and fully charged or connected to power. If your accessory uses batteries, see if they need to be replaced.
4. If there's an app that you use with the Bluetooth accessory, go to Settings > Privacy > Bluetooth on your iOS or iPadOS device, and make sure that you've turned on Bluetooth for the app.
If you still can't pair or connect your Bluetooth accessory
1. If you previously connected your Bluetooth accessory to your iOS or iPadOS device, unpair the accessory, put it back in discovery mode, then try to pair and connect it again.
2. If you can pair your accessory with some devices but not your iOS or iPadOS device, unpair the accessory from your other devices. Then try to pair with your iOS or iPadOS device again.
You can also find those steps in this resource: If you can't connect a Bluetooth accessory to your iPhone, iPad, or iPod touch - Apple Support
Should that still persist, you'll want to reach out to Fitbit: Get Support They'd be in the best position to assist further with troubleshooting their device.
Take care.