new contact for access to MPSA agreement in business portal gives day in day error

Hi, I understand how confusing that error can be when you’re just trying to add a new contact.

This usually happens because the system can’t validate certain details in the invite form, often something small like missing or incorrectly formatted information.

A quick fix that works for many is to temporarily enter a dummy phone number in the Business Phone field, then remove it before submitting again.

Also, make sure you’re using a supported browser and try in a private window to rule out cache issues.

If it still fails, could you confirm if your account has the correct admin role for MPSA and whether the email your inviting is a business address?

These details will help narrow down the cause.

Regards,
Aron

Dear @Kuijper, Peter, 

Good day! Welcome to Microsoft Q&A forum! 

Based on your description, I understand that you're encountering a ‘day in day’ validation error when trying to invite a new user to access your MPSA agreement in the Business Portal, and you’re looking for support on this.

I sincerely apologize for the inconvenience caused by this issue.

Regarding your situation, since this issue is related to your MPSA agreement, it will require a backend team review.

Besides, the agreement was purchased through a third‑party reseller, please reach out to your reseller so they can help you to raise a support request with Microsoft.

You could ask them to follow the steps outlined in this article to raise a support ticket: Get support for Microsoft 365 for business

Additionally, regarding the Business Portal you mentioned, could you please share a screenshot of what you’re seeing? This will give me a visual reference and help me understand the exact page and provide guidance on how to submit a support ticket directly, if your tenant is managed by the reseller.

You could share the screenshot via Private Message so that your information is secured.

Kindly let me know when there are updates or if you need further assistance. Any updates you’re able to share would be really helpful. I appreciate your time and look forward to hearing how things are going! 

Thank you for your time and patience.

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