Why is my iPad Pro not showing iPad os 16 in update

I was having the same issue.

Back when apple announced iPadOS I've enrolled in beta but got only 15.X

In order to make iPadOS 16 show up:

1. in `general` -> `VPN & device management`.
   1. Remove beta enrollment, as said before by @MichelPM
2. in `general` -> ` Transfer or Reset IPAD`
   1. Reset all settings.
   2. but kept the data.
3. it reboots, then when it started back I could see update to IPadOS is also avaiable.

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Reference:

Unenroll Your Devices (apple.com)

What iOS/iPadOS version is this iPad, currently, running? Your iOS/iPadOS version maybe too far behind in iOS/iPadOS versions.

What is the rated, internal data storage space/capacity of your iPad model and how much of this free, internal data storage capacity is left inside of your iPad model?

All of that additional info can, also, be found in the Settings app, General settings panel, About.

Your iPad needs sufficient free internal data storage space. At the very least, 7-8 GBs or greater internal, free data storage space.

Is your iPad using/running a VPN? You need to, temporarily, disable the VPN.

Is your iPad running an iPadOS Beta version? You need to remove/uninstall the iPadOS Beta software before you will be able to install the Apple “officially” released version of an iPadOS upgrade/update.

Also, make sure your iPad is charged to, at least, 50%, or greater, before attempting the iPadOS upgrade/update.

You may need to use a Mac or Windows PC to do the iPadOS 16.1 upgrade.

If you have access to a full computer, like a Mac or Windows PC, try either using the Finder on a Mac that has the newest macOS Catalina, or later macOS, installed OR with an older Mac with an older Mac OS, download and install the latest iTunes version ( or latest iTunes for Windows PC ), make sure the Mac or Windows PC is connected to the Internet, connect your iPad by the USB charge cable to the computer and let the iTunes application upgrade/update that iPad model, using the iTunes Software Update feature, to get your iPad to iPadOS 16.1.

Make sure your iPad is, at least, charged to 50% or greater to attempt this.

Also, make sure your iPad has, at least, between 6-8 GBs of free internal data storage space for downloading and installing a major iOS/iPadOS upgrade.

Make sure your desktop/laptop computer has plenty of internal drive storage space, also.

Also, make sure to do a backup of your iPad's data, prior to upgrading/updating.

Backup to Apple iCloud and/or a full Mac or Windows PC using the same iTunes app OR, if a newer Mac running macOS Catalina, or later, making a backup using the macOS Finder app.

How to back up your iPhone, iPad, and iPod touch - Apple Support

If NO access to a Mac or Windows computer, you will have to seek help from a good friend or family member, with a full Mac or Windows PC, to help you out

OR

Search online to locate and call contact your nearest, “local” Apple Store location to try/attempt to make an appointment to get your Apple iPad upgraded/updated to its latest iPadOS 15 version.

OR, alternatively, use the “Get Support” link, at the upper right hand corner of every Apple Support Community Webpage to attempt to schedule an appointment with your nearest Apple Store location.

Apple Store employees will be glad to help/assist you.

Best of Luck to You!

Seemed to be a bug, because after updating my iPad Pro to 15.7.1 the option to upgrade tot 16.1.1 suddenly appeared under Settings.

Since you, apparently, did not read this entire post, I will have to ask again...

Do you, perhaps, have a beta iPadOS version/profile still running on your iPad?

You will need to remove/uninstall the iPadOS beta version/profile before your iPad will see the iPadOS 16.1 upgrade.

1. Go to Settings > General, and tap VPN & Device Management.
2. Tap the iOS Beta Software Profile.
3. Tap Remove Profile, then restart your device.

Do you, perhaps, have a beta iPadOS version still running on your iPad?

You will need to remove/uninstall the iPadOS beta before your iPad will see the iPadOS 16.1 upgrade.

Check Software Update, again, and scroll al the way down the bottom of the Software Update screen.

When you go into the Settings app, General, Software Update and scroll to the bottom of the screen, no panel stating Upgrade to iPadOS 16?

For much newer design iPad models, without a Home button, try the new simple hard reset/forced restart procedure for the new 2018-2022 iPad Pros, 2020/21 iPad Air 4 and 5 and 2021 iPad Mini 6 models.

1. Press and release the volume button closest to the top Power button

2. Then immediately press and release the volume button farthest from the top Power button.

3. Then, press and hold the top single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.

Once you have performed all the steps, wait for a few seconds and your 2018-2022 iPad will boot up completely to the iPad’s Lock screen.

Hello ~ When you go to Settings > Software Update is the option to upgrade is the lower right hand corner?

I've tried the reset, tried everything I can find. My 2021 iPad Pro 11 inch with 1.7TB of available space does not see the 16.1 update and continues to say that 15.7.1 is the current release.

I did read your whole post. No beta software has ever been installed on this iPad. It is stuck on 15.7.1 installed as a regular release.