Microsoft 365 Error Codes

How to Fix Microsoft Developer E5 Tenant Signup Error 40315

Anum Mushtaq Oct 13, 2026 868 views

Question details

Users are unable to complete the Microsoft Developer Program signup for an E5 tenant due to error code 40315 regarding phone number security checks.

Product: Microsoft 365 Developer Program
Device & OS: not provided
Scenario: Creating an E5 developer tenant and verifying a phone number.
Observed behavior: The system rejects the phone number verification, displaying error 40315 and halting the signup process.

Before you start

Ensure you have a stable internet connection and are using a valid, non-VoIP mobile phone number from a major carrier that has not been flagged for suspicious activity.

Solution 1Recommended

Verify Signup Link and Phone Number Eligibility

Check for broken URLs and ensure your phone number meets Microsoft's strict security criteria.

Microsoft's security systems frequently flag incomplete URLs or specific types of phone numbers (like VoIP or virtual numbers) during the developer tenant setup.

Check the signup URL

Ensure the signup link you are using is complete and hasn't been truncated or improperly pasted in your browser's address bar.

Use a standard mobile number

Enter a traditional mobile phone number from a recognized carrier. Avoid using VoIP (Voice over IP) numbers, landlines, or virtual numbers, as these often fail security checks.

Try an alternative number

If your current number is rejected with error 40315, try using a different, valid mobile number.

Clear browser cache

Access your browser settings to clear cache and cookies, or open a new Incognito/Private browsing window to restart the signup process cleanly.

Solution 2

Contact Microsoft Business Support

Escalate the issue directly to Microsoft Support if changing phone numbers and verifying links does not resolve the error.

Free Microsoft Office alternative

Try WPS Office While Waiting for Microsoft Support

While dealing with Microsoft Developer account issues or waiting for support to resolve your tenant signup, you can use WPS Office. It is a free, lightweight, and highly compatible alternative to Microsoft Office that does not require complex tenant setups or strict phone verifications.

1. Download the software: Visit the official WPS Office website and download the free installer for your operating system.
2. Install WPS Office: Run the downloaded installer and follow the on-screen prompts to set up the application.
3. Open and edit your files: Launch WPS Office to instantly open, edit, and save your existing Microsoft Office documents without any subscription barriers.

Highly compatible with Microsoft Word, Excel, and PowerPoint file formats.No complex account setups or developer tenant approvals required.Free and lightweight software with a familiar, easy-to-use interface.Includes built-in PDF editing, cloud collaboration, and smart AI tools.

Frequently Asked Questions

Why does Microsoft reject my phone number with error 40315?

Microsoft uses strict security algorithms to prevent spam and abuse. VoIP numbers, virtual numbers, or numbers previously flagged for suspicious activity are often rejected during the developer program signup.

Can I bypass the phone verification step for the Microsoft Developer Program?

No, providing a valid mobile phone number is a mandatory requirement to verify your identity and successfully secure the E5 developer tenant.

How long does it take for Microsoft Support to resolve tenant signup errors?

Resolution times vary, but Microsoft business support typically responds within 24 to 48 hours, depending on your region and the current volume of support requests.

Does error 40315 mean my Microsoft account is banned?

Not necessarily. Error 40315 specifically indicates that the phone number provided did not pass the immediate security check for tenant creation, not that your entire Microsoft account has been suspended or banned.

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