There are a number of issues that can cause this situation.
A Google search on 'Orphan MSDTC Transaction' will give you a number of references about potential causes and how to troubleshoot them.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara