VsTest task does not work with multiple categories

[anunay1]

I am trying to run tests with multiple categories using the vstest task in azure pipeline using the below syntax.
"TestCategory=XXX&TestCategory=XXX"

but it always fails with the below error:
No test matches the given testcase filter TestCategory=XXX&TestCategory=XXX in C:\TestLabAgent_work\1\s\APPIUM\RobotWare7\XXX.XXXXX.XXXXXXXXX.Test.Automation\bin\Release\XXX.XXXXXXXX.XXXXXX.Test.Automation.dll

Please help as I need to urgently execute some test cases with only these two categories.