How to fix 403 error in google authentication in xamarin formats for accessing web resources in android app

thanks in advance.....

I got this error when connecting to my cloud azure window app via google authentication.

"403. error error: disallowed _useragent this user agent is not allowed to make an authorization oauth request to google because it is changed as a built-in user agent according to our policy, only the browser is allowed to authorize a google request. We offer several libraries and samples for our own applications to execute a browser authorization request. "

how to fix this error .....