Mac Book Pro 2016 caught in reboot mode over and over after IOS upgrade

Macs don't run iOS, that's the OS for the iPad or iPhone. They run MacOS.

command-option-shift-R is internet recovery at startup.

command-R is simple recovery if the operating system install was successful.

You may be running into an issue whereby the system never fully upgraded. Connect your Mac to ethernet, even if it is with an adapter, and try restarting again so it can finish the downloads.

You can also use the serial number on the bottom of the Mac to verify the model on http://checkcoverage.apple.com/

Do not post the serial number on the forum, just let us know the model/year it states from the serial number. If that's where you got MacBook Pro 2016, see if it can give you further details like purchase date, or date coverage ended.

Perhaps the users' date for this machine is Off, which can happen " Mac Book Pro 2016 "

Yosemite was released to consumers on October 16, 2014.

OS X Yosemite - Technical Specifications (CA)

Otherwise - follow previous contributors' suggestion(s). 😎

The outcome you got is not necessarily normal, nor is it unexpected. If you carefully read the license agreement, you will see Apple is not responsible for data loss or malfunctions during updates. This is why both the update documentation and documentation across the internet says backup your data before performing any update.

A clone backup, is generally the best to do prior any update, because you can test boot it, and test that it behaves exactly like the original:

Backup now, or forever hold your peace - … - Apple Community

Apple already also considers 2016 Macs legacy:

Obtaining service for your Apple product after an expired warranty - Apple Support

which means, the odds are higher that something could go wrong in the process.

For one thing batteries are only known to last 2-5 years:

Batteries - Apple

Sometimes older equipment does get out of warranty coverage, if a general problem is noticed:

Apple Service Programs - Apple Support

While you may choose not to upgrade, important security precautions that have been addressed with newer software may not be available on older software.

I have also written a user tip so you can decide if you can continue using older software:

https://discussions.apple.com/docs/DOC-250003586

Note Catalina and higher are 64 bit only operating systems, requiring upgrading all software and drivers if you are using anything higher than Catalina.

I hope the service center can break the loop for you.

Follow on

It is highly improbable that " I Updated the IOS as prompted to from Yosemite to Monterey " would even offer an upgrade to macOS 12 Monterey

That type of Offering ( upgrade ) was only offered starting in macOS 10.14 Mojave

"The larger question is why would my mac prompt me to upgrade to Monterey when this is the outcome?"

Because that's the needed upgrade.

Things go wrong with updates sometimes, but that can happen with any update, upgrade, app installation and etc.

I dare no make a definite conclusion until we get a Screen Shot from About this Mac

Only meant as an illustration of what type of Information could be presented using the previous suggestion.

In your computers case, there might be more info than in image below