I can't add my Sprocket Studio printer to the app. I already have the Sprocket 200 installed on the

@NavyMom32
 
Welcome to the HP support community.
 
Reset your mobile device and Sprocket

Turn off your mobile device, and then turn it back on.

Turn on the Sprocket.

Remove the Paper Cover, and then use a narrow object, such as a pen or paperclip, to press and hold the Reset button for 3 seconds until the Sprocket turns off.
note:
The location of the Reset button varies by Sprocket model. Typically, the button is located underneath the Paper Cover, but can also be found on the outside next to the charging port.

Example of resetting the HP Sprocket Select Photo Printer

Turn on the Sprocket.

Upgrade the Sprocket firmware

Make sure the Sprocket is on and your mobile device is connected to the Internet.

On your mobile device, open the HP sprocket app.

Tap the Menu icon , and then tap sprocket.

Tap Manage Printers, make sure your Sprocket is selected, and then tap Printer Settings.

Look for a firmware upgrade.

If a firmware upgrade displays, tap Get Firmware Upgrade, and then follow the on-screen prompts to complete the update.

If a firmware upgrade option does not display, the firmware is up-to-date.

You can refer this HP document for more assistance:- Click here
 
I hope that helps.
To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.
Cheers.