Google chat Integration

I have created a integration for integrate google chat space but it shows an error like :- 

"error-result-label

You are not permitted to perform the requested operation

error-result-guidance

The external system understood the request but refused to authorize it HTTP/1.1 403 Forbidden"

When I click on "Click here to authorize," the authorization is successful, but it still shows the same error afterward.

Am I forgetting to pass any necessary parameters?

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