You can easily link your Google Workspace account to Instantly by enabling OAuth app access.
Here are the steps on how to connect Google accounts via the oAuth method:
Step 1: Log in to Instantly
Go to the Email Accounts dashboard
Click Add New.
A pop-up will appear. Select Connect existing accounts and choose Google.
Select Option 1: oAuth
Copy the Client ID to search for Instantly in the Google Workspace Admin console
Step 2: Configure Instantly oAuth in your Google Workspace Admin console
Log in to your Google Workspace Admin console
Navigate to the Security section in the left menu.
Under the Security section, select Access and data control > API Controls.
In the API Controls panel, click MANAGE APP ACCESS
Click "Configure new app" to add Instantly as an OAuth App.
Paste the Client ID into the 'Search for app' field. Note that entering 'Instantly' instead of the Client ID will not work.
Here is the Client ID: 536726988839-pt93oro4685dtb1emb0pp2vjgjol5mls.apps.googleusercontent.com
Once you click Search, you will see Instantly OAuth Email v1 in the results.
Click on the Instantly OAuth result and select All users as the Scope
Choose "Trusted" as the access type
Review the options you selected and click Finish to complete the OAuth Setup
After configuring, "Instantly OAuth Email v1" will appear in your list of Configured apps.
Step 3: Complete the connection process in Instantly
You can now proceed with connecting all Google accounts from the same Google Workspace.
Connecting Google Admin Account
Go to the Email Accounts dashboard
Click Add New.
A pop-up will appear. Select Connect existing accounts and choose Google.
Select Option 1: oAuth
After you configure the Instantly oAuth, simply click Login to connect Google accounts from the same Google Workspace
Choose the Google admin accounts in the pop-up window
Click Continue to proceed with the login.
Then, click Allow to grant Instantly access to this Google account.
Connecting Google User Account
If the other users' Google accounts are not visible in the pop-up window, please click 'Use another account' to log in to other Google accounts in the same Google Workspace.
Note: It might be worth trying to add these accounts from the Incognito window, in case all of your Google accounts appear here.
In Incognito, your previous login sessions won't be stored, so you can easily add an account you need.