I'm trying to connect my 10th Generation IPad to my Iphone 12 Pro via Bluetooth.

Bluetooth and Wi-Fi connections are used for various communications on iPhone and iPad.

Particularly Bluetooth for audio input and output.

Both AFAIK, for AirPlay to Apple TV or Mac, too.

And use Wi-Fi for HotSpot.

But iPhone and iPad don't use manual Bluetooth pairing—and that is very specifically referencing Bluetooth pairing—for communications between an iPhone and an iPad.

For communications between iPhone and iPad (including AirDrop and Continuity and such), they either use an ad-hoc Bluetooth network, or use a known or ad-hoc Wi-Fi connection, and with the appropriate authentication usually tied to the Apple ID.

What, specifically, do you hope to achieve by pairing an iPhone and iPad over a Bluetooth connection?

Whilst it is technically possible to do so, for the majority of applications, Bluetooth pairing of an iPad and iPhone is entirely pointless. If your intention is to use Cellular Hotspot features of your iPhone, this link is optimally achieved using the native WiFi hotspot connection - this being a largely automated process. Hotspot connections over WiFi offer substantially greater throughput, range and reliability.

How to set up a Personal Hotspot on your iPhone or iPad – Apple Support

If you still wish to pair your iPad and iPhone over Bluetooth, you first need to manually enable the hotspot feature on your iPhone:

Settings > Mobile Data > Personal Hotspot > Allow Others to Join - set to ON

Next, Bluetooth for both the iPad and iPhone must be placed in Discovery mode:

Settings > Bluetooth (accessing this page will automatically place the device in Discovery mode)

Whilst both iPad and iPhone are in Discovery mode, you can mutually pair the devices.

Again, I must stress, unless you have an unusual “edge case”, pairing of iPad and iPhone over Bluetooth is largely pointless.

Ctwilder1949 wrote:

What I’m trying to do is get the iPad battery to show in the batteries widget.

The iPhone and IWatch batteries show in it.

In my research to try to figure out why I thought I saw a suggestion to pair the phone and iPad.

Would you have anything else I might try to get the IPad battery to show on the batteries widget?

That would involve the widget maintainer gathering and displaying that info for whatever display widget is here.

iPhone and Apple Watch are paired (and not in the same Bluetooth “pairing” sense, though Bluetooth is involved), so they can share some status information. iPhone and iPad are not, and don’t.

And iPad generally doesn’t run monitoring apps in the background, which might mean using push notifications or such, or running periodically and sharing the data to iCloud or such.

Cloud Battery is an app that appears to provide what you seem to be asking about.

You’re telling us how you’re trying to do something - actually using an impossible method.

Instead you should tell us what you’re trying to do, as there is almost certainly a way to accomplish it.