Q: updated phone to IOS 9.3 and I am not able to access my phone

Can you describe the issue in more details?

What happens when you type this password?

Check these articles and follow the instructions.

If you forgot your Apple ID  - Apple Support

If you forgot your Apple ID password  - Apple Support

https://iforgot.apple.com/appleid

Seems like Apple has temporary  troubles with their activation servers. Lots of users report this issue.  If you are the original owner and you are sure it is correct id  take your device and documents confirming the ownership to the  Apple Store or contact Apple.