Adding a suppression xml causes step to fail

[LackOfGravity]

Scan runs correctly and produces report.

However, when I add a suppression file the scan fails with the error below

Looking at the Logs I can see that there is a warning..

[WARN] Unable to create temp file for suppression file'D:\a\15\s$\XXXX\DependencySuppression\DependencySupression20210630.xml'

Followed by:

[ERROR] Exception occurred initializing Vulnerability Suppression Analyzer.

YAML:

steps:

• task: dependency-check.dependencycheck.dependency-check-build-task.dependency-check-build-task@6 displayName: 'Dependency Check' inputs: projectName: 'XXXXMain' scanPath: '$/XXXX/Main' suppressionPath: '$/XXXX/DependencySuppression/DependencySupression20210630.xml' warnOnCVSSViolation: true

XML file is under source control .