Tax profile and support portal both fail (individual developer, Microsoft account)

Open the tax form from the Payout and tax profile assignment page for the correct program and Seller ID; if the same SSO loop persists, report it as a Partner Center tax-profile handoff failure and separately open an Engage Center platform case through its built-in Help page.

1. Launch the correct developer tax profile

Because Edge, Chrome, InPrivate mode, and third-party cookies have already been tested, do not repeat those browser checks.

1. Sign in to Partner Center with the Microsoft account associated with the individual developer account.
2. Select Settings (gear) → Account settings.
3. Select Payout and tax profile assignment.
4. Find the relevant program and Seller ID, select Edit, and then:
   • Select the existing developer tax profile, or
   • Select Create a new tax profile.
5. Set:
   • Permanent residence country/region: Morocco
   • The account type corresponding to the individual developer account.
6. Launch the tax form from the tax-form section.

Partner Center distinguishes the developer profile from other program profiles, so the correct program/Seller ID assignment matters. Managing the profile requires the Owner or Financial Contributor role. As a publisher outside the United States, the expected US form is generally an IRS W-8 form. An ITIN is not required to receive payments or claim treaty benefits.^1^

If the form opens successfully, complete it and then select Finish at the top right before selecting Complete. The resulting status should become Pending Microsoft Validation, with validation taking up to 48 hours.^1^

The exact Error occurred in SSOlogin method failure has also been reported for the Partner Center W-8BEN handoff, but the matching report has no accepted resolution.^2^

2. Escalate the persistent tax-form failure

If the correct developer profile, Seller ID, and role are already selected and the SSO error continues, Microsoft support must investigate the Partner Center-to-tax-provider handoff.

If Partner Center displays either the AI assistant or Help icon:

1. Open AI assistant or Help (?).
2. Enter a summary such as:

   Individual Marketplace developer using a Microsoft account.
   Settings → Account settings → Payout and tax profile assignment → [program/Seller ID] → tax form loops between “Error occurred in SSOlogin method” and “Une erreur est survenue.”
   Tax residence: Morocco. Reproduced in Edge InPrivate and Chrome with third-party cookies enabled.

3. Select Contact Support.
4. Select the closest available problem type for Partner Center, Payout and tax, or Tax profile. Category labels are workspace-dependent, so do not select an unrelated category merely to submit the case.
5. Select Review solutions → Create support request → Submit.
6. Include:
   • Seller ID and program name
   • UTC timestamp of the latest failure
   • Full error text and screenshots
   • Whether the failure occurs while creating or editing the profile
   • Any correlation/request ID shown

This is Microsoft’s documented Partner Center support workflow, but the article describes sign-in using a work account. It therefore may not expose ticket creation for an individual account authenticated only with a Microsoft account.^3^

There is no documented dedicated Microsoft-account tax-support route in the available Partner Center guidance. Windows Developer Center support has been recommended in a similar individual-developer enrollment case, but that case concerned enrollment rather than a tax-form SSO failure, so treat it only as a fallback routing option.^4^

3. Report the Engage Center loading failure separately

If Engage Center loads far enough to show its header:

1. Select the question-mark icon.
2. Open How can we help?
3. Request assistance for an Engage Center platform/access problem, explaining that the page never finishes loading and prevents creation of the Partner Center tax-profile case.

Microsoft states that this channel handles Engage Center platform and feature problems by email, typically within eight business hours.^5^

If Engage Center does not load enough to expose Help, test it once from a different network, such as a mobile hotspot. If that works, have the network administrator allow the Engage Center endpoints—particularly engagecenter.microsoft.com, engagehub.microsoft.com, gateway.engagehub.azure.com, login.microsoftonline.com, and login.live.com—over ports 80/443. Conditional Access policies targeting Azure management resources can also block the portal.^6^

As a final routing attempt—not a guaranteed Partner Center tax-support channel—use Microsoft’s general support page while signed in with the same personal Microsoft account and request routing to Partner Center / developer account financial or tax-profile support.^7^

References

1. Set up Microsoft Marketplace payout and tax profiles
2. Error occurred in SSOlogin method when filling out W8-BEN form on ...
3. Get help and contact support in Partner Center
4. Problem enrolling in Windows apps partner program - Microsoft Q&A
5. Microsoft Engage Center help
6. Microsoft Engage Center connectivity guide
7. Contact Microsoft customer support | Microsoft Support