When attempting to log in to the Tier1 Inbox add-in, the user receives the following error message: “Error in retrieving session token, please check console log for details”.
Resolution 1: This error most commonly occurs when the Custom Domain (My Domain) URL is entered incorrectly in the settings.
Correct: tier1fin.my.salesforce.com
Incorrect: tier1fin.lightning.force.com
Users mistakenly paste their Salesforce lightning home page URL instead of the specific My Domain URL.
Resolution 2: If the domain format is correct, the Tier1 Inbox Connected App may not have been installed during onboarding
Steps to fix
Log in to Salesforce as an administrator.
Click Setup → search for OAuth Usage. Click on the setting: Connected Apps OAuth Usage.
Locate Tier1 Inbox in the list.
Click Install under the Actions column.