Let me help and provide insight about how to get the money in the MTN mobile number in QuickBooks Online (QBO).
Currently, there is no direct integration between MTN mobile numbers and QuickBooks Online (QBO) for transferring money. QuickBooks Online primarily focuses on managing your business finances, including invoicing, expense tracking, and other accounting functions.
If you need to receive payments from your customers using MTN mobile numbers, you may consider using a third-party payment gateway that supports both MTN mobile payments and QuickBooks Online.
I'm also including these resources that offer guidance on retrieving your data, files, recent activity on your account, and methods for changing sign-in information in the Intuit Account Manager: