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Rishabhhariyani
Level 1
August 21, 2026
Question

Marketo Salesforce OAuth sync issue

  • August 21, 2026
  • 3 replies
  • 62 views

I am trying to move to OAuth connection in my Marketo instance but my Salesforce team has an SSO and security policy in place which is not allowing me to login in Salesforce by entering the credentials in the Salesforce pop-up.

Can someone help on this if they have faced a similar issue like mine? 

    3 replies

    PeeyushSachdeva
    PeeyushSachdeva
    Level 5
    August 21, 2026

    Hey ​@Rishabhhariyani, 

    If your Salesforce org has SSO/security policies that are preventing the Marketo Sync User from logging in with username/password through the Salesforce OAuth popup, then this may need to be checked from the Salesforce side.

    I would suggest checking with your Salesforce admin to see if there are any authentication policies or profile settings assigned to the Marketo Sync User that are blocking this OAuth flow.

    Also, make sure you are using the correct Marketo Sync User and try the setup from an incognito/private browser. This can help avoid accidentally authenticating with a different Salesforce user.

    Marketo has a helpful step-by-step documentation that walks through the OAuth setup for Salesforce. You can follow it here: https://experienceleague.adobe.com/en/docs/marketo/using/product-docs/crm-sync/salesforce-sync/log-in-using-oauth-2-0

    RishabhhariyaniAuthor
    Level 1
    September 2, 2026

    Thank you for your Input. It seems there is a security policy in place as I am able to connect my UAT instance but facing a login issue while trying to connect with Production.
    I’m trying to access if there’s a workaround for the policy which would allow the sync user to login via Marketo and connect with Salesforce.

    PeeyushSachdeva
    PeeyushSachdeva
    Level 5
    August 21, 2026

    Also, a few prerequisites as per Marketo’s documentation:

    • API access must be enabled for the Salesforce Sync User (if you are a Salesforce Professional Edition user, that access is not available by default—contact your Salesforce Account Executive).
    • Marketo Sync user has to be created in Salesforce.
    • For existing customers, Feature to “Enable OAuth for SFDC sync” is enabled on the customer’s subscription.
    • Pop-up blockers are disabled.
    • Connected App is created and the Consumer Key and Consumer Secret are available for use.
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