Hi Jamesjacklintransport,
Thanks for using the Apple Support Communities. I'm a bit unclear on the exact nature of the issue you are describing. If you are having issues with device passcode on your iPad, you may find the information and troubleshooting steps outlined in the following article helpful:
If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support
If you are talking about having changed your Apple ID password, you may want to double-check that you followed all of these steps afterwards:
What to do after you change your Apple ID email address or password - Apple Support
Regards.
After I updated I changed my password and now my iPad won’t recognise it but my iPhone will
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iPad not allowing me to sign in after update