Can you help how to fix Error code: 81901? Thanks

Hello there, theavy.

Thanks for reaching out to the QuickBooks Community. Could you please confirm if the error is related to your QuickBooks Online payment subscription?

If that is, you may need to update your payment card and billing information. Follow these steps to update your billing information.

Here's how:

1. Sign in to QuickBooks Online.
2. Go to Settings, then select Account and Settings.
3. Select the Billing & subscription tab.
4. Select Edit ✎ for your Payment method.
5. Update your billing info.
6. Select Save.

If the same thing happens, you can contact our Customer Support Team. They can review your file and provide additional steps to fix it.

Also, here's a compilation of how-to videos for QBO that you can access to further help you finish your tasks. Feel free to open them whenever needed. 

Kindly keep us posted so that we can follow up on our end.