Dear Hasan Ahmadinajm,
Good day!
Thank you for posting to Microsoft Community. We are glad to assist.
As per your mentioned description about "Error code 43881"My sincerest apologies for the inconvenience this might be causing you. I therefore believe that this issue should be further investigated by our Billing support team. Billing support Engineer can further connect with you remotely, for further troubleshooting and involve the backend team where need be. Please understand that as public forum support, we don’t have higher permissions to check this. your scenario maybe inconveniencing, to quickly help assist, kindly contact your organization admin or you can create a service request to report this symptom to our online channel.
Below are the steps to open service request:
Here is contact support document: Get support - Microsoft 365 admin | Microsoft Learn
Note: In most countries or regions, billing support for Microsoft 365 for business products and services is provided in English from 9 AM-5 PM, Monday through Friday. Local language support varies by country or region.
Thanks for your precious time and your understanding would be highly appreciated. Have a nice day!
Best regards,
Inema | Microsoft Community Moderator