Google OAuth Out-of-Band OOB Warning and Alternative Flow Security Requirements 2022

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Google is deprecating the OAuth Out-of-Band (OOB) flow. This has been the method that PC Apps use to request OAuth tokens. An OAuth token is the result of the "This App want to access" screen that shows Contacts and Calendar for Outlook Sync tools.

To help protect your account, Google will soon block apps that don't comply with Google's security policies.

You can let the app developer ( know that this app should stop using unsupported OAuth flows.

Sign in with Google: Access blocked - App sent an invalid request


Starting in Fall 2022, Google says they will show Access Blocked: App Sent an Invalid Request message for any App using the deprecated function.

According to Google's Documentation: "OAuth out-of-band (OOB) is a legacy flow developed to support native clients which do not have a redirect URI like web apps to accept the credentials after a user approves an OAuth consent request. The OOB flow poses a remote phishing risk. PC Apps must migrate to an alternative method to protect against this vulnerability.".

CompanionLink and OAuth OOB

CompanionLink is ready with the new Google OAuth method. You will need CompanionLink Version 9 (build 9070) or CompanionLink Version 10 (build 10014 or higher). This is a drop in replacement. You might be required to sign into your Google Account via CompanionLink again after updating. If you are in sync with Google currently, there will be no change needed until the OAuth token needs to be refreshed.

How to get the latest version of CompanionLink:

  1. Click Here to download the latest version of CompanionLink.
  2. Once downloaded, click the downloaded setup file and click Install.
  3. Select Yes on the Windows UAC popup.
  4. Select OK to Finish the installation.

If you have an existing license to CompanionLink *Click Here to verify which version of CompanionLink you can use.

Switching to CompanionLink from a Competitor

How to Sync Outlook with Google

While CompanionLink has been ready for the OAuth OOB change since the announcement, our sync competitors might not be as quick to fix the issue. CompanionLink is offering a $10 discount for converting to our Google and Outlook sync solution. This discount applies to anyone who has used the following sync tools:

  • Sync2
  • gSyncit
  • OggSync
  • Go Contact Sync Mod
  • Outlook Google Calendar Sync

For a Free Trial of the latest version of CompanionLink for Google click the following link for our Downloads Page.

  • To claim your $10 discount:
  1. Use the following link to Buy CompanionLink for Google.
  2. Enter Product you are switching from in the "What Motivated You to Purchase" box.
  3. Enter "OOB22" in the Affinity Code Box.

CompanionLink for Google
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Free 14 day trial. Price $14.95 3-Mo Subs - $69.95 One-time License.