#{bindings.LegalEmployerName.inputValue} & #{bindings.LegalEmployerName.attributeValue} not working

Summary:

I am trying to embed a report to the worker time card page through Page Composer (HTML markup component with IFRAME)
and parameterize it with legal employer value using #{bindings.LegalEmployerName.inputValue} however it seems it's not capturing/returning
or passing any values even though the binding itself is the page attribute itself already form the expression builder.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):
<iframe src="https://fa-sampledev-devxxxxx-saasfaprod1.fa.ocs.oraclecloud.com/xmlpserver/Custom/Folder1/ReportXYZ.xdo?_xmode=4&_xf=html&_xpt=1&PERIOD_START=#{pageFlowScope.tcPeriod}&LEGAL_EMP=#{bindings.LegalEmployerName.inputValue}"