why Quickbook Online Global cannot work now? it cannot integrate

Welcome aboard, ain.
 

It'll be my pleasure to help you figure out why the integration isn't working and get your system running smoothly again. To do that, I need more information to provide a more appropriate resolution.

May I know what specific application or service are you trying to integrate with QBO Global? Are there any error messages or code you see when you attempt the connection? Can you also specify what's not working on your end? 

Please know that any additional details would help us narrow down the issue. Any screenshots added would be much appreciated. I'll be on the lookout for your response.