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: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 14 Mar 2017
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