Invalid Grant - Error Message

"'Noam Moravtchik' via Blogger Developer Group" <[email protected]> Sun, 4 Feb 2018 09:32:04 -0800 (PST)
Newsgroups gmane.comp.web.blogger.api
Message-ID <[email protected]>
Hello,

I am an App owner in the Wix app store and I am using the Google API token 
for Blogger. When trying to refresh my token for the API request, I receive 
a "Invalid Grant" notification error. 

Unfortunately, this means that all of the Wix App users now receive an 
error once attempting to view the app on their websites (apx 400K using 
this app)

I did not change anything in my code nor in your dev console. and this 
suddenly happened yesterday morning (07:00~ GMT+2)

please help me understand what needs to be changed in order for the app to 
work. Thanks in advance.

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