DOI Registration in OJS 3.4.0.1

I have upgraded to the latest version in the latest version DOI management is changes no I have assigned the DOI & deposited also but it is not registered, I have deposited 3 days back.

What application are you using?
For example, OJS 3.4.0.1

Additional information
Please add any screenshots, logs or other information we can use to investigate this problem.

Please reply with the solution