IssueTracker

I'm encountering an issue when using the OAuth2 library in Google Apps Script. I'm trying to create an OAuth2 service to authenticate requests to the Google My Business API, but I'm getting an error message that says setRefreshToken is not a function.

Here's the code I'm using:
function getOAuthService() {
  return OAuth2.createService('MyService')
    .setAuthorizationBaseUrl('https://accounts.google.com/o/oauth2/auth')
    .setTokenUrl('https://accounts.google.com/o/oauth2/token')
    .setClientId(CLIENT_ID)
    .setClientSecret(CLIENT_SECRET)
    .setCallbackFunction('authCallback')
    .setPropertyStore(PropertiesService.getUserProperties())
    .setRefreshToken(REFRESH_TOKEN)
    .setScope('https://www.googleapis.com/auth/plus.business.manage');
}


I've confirmed that the OAuth2 library is correctly added to my project, and I've tried re-initializing the library, but the error persists.

Any help in resolving this issue would be greatly appreciated.