Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello @Mohd Imran Ansari,
Based on the information you provided, it appears that you are unable to contact Microsoft Support by phone, and you are also encountering error code 43881 when trying to sign up for an Intune trial subscription.
This error can sometimes occur when Microsoft's backend is unable to validate the payment method associated with the tenant. To help troubleshoot the issue, please verify the following:
- Ensure that your billing profile and tenant country/region are configured for the same region.
- Confirm that your account information, including address, name, postal code, and other billing details, is accurate and matches your payment method.
- If possible, try using a different payment card or a different trial subscription type.
Additionally, please try the registration process using:
- A different device or network.
- An InPrivate/Incognito browser window.
If the issue persists after verifying the above, as a Microsoft 365 administrator, you can contact Microsoft Support through the Microsoft 365 Admin Center.
Please refer to the following article for guidance on creating a support request: Get support - Microsoft 365 admin | Microsoft Learn
When submitting the ticket, please include all troubleshooting steps you have already performed along with relevant screenshots. This information can help the support team investigate the issue more efficiently.
Please feel free to let me know if you have any update or further concern about the issue.