"Import" REST Api call doesn’t work when Importing PBI report consuming existing dataset and with cross tenant

"Import" REST Api call doesn’t work when Importing PBI report consuming existing dataset and importing with cross tenant account. I have already raised a MS Support ticket (119012526003971) but got response that its not possible at present and need to raise a new idea.
Scenario:
• Create Report in Dev Env.
o Create PBI report (e.g. mypbireport1.pbix) using Powerbi desktop and AAD account (e.g. abcdev@test.com), which is connecting to external Datasource and then publish to a workspace e.g. devws. It creates dataset in Powerbi service with name as mypbireport1. (we can use either PBI desktop or Powershell REST API call to publish this kind of report)
o Create another report under same WS i.e. devws and using same AAD account (i.e. abcdev@test.com), mypbireport2.pbix and select mypbireport1 as datasource, which is created by mypbireport1 report publish. (for this kind of report, we can use Powerbi Desktop or Powershell command New-PowerBIReport to publish this.
• Now we are moving to suppose staging env and need to use AAD credentials for staging (e.g. abcstag@test.com)
o Use Powershell REST API to move the report mypbireport1.pbix to Staging env in new workspace (e.g. stagws). It creates dataset in Powerbi service with name as mypbireport1.
o Success scenario – Use Powerbi Desktop to first change the datasource connecting to dataset mypbireport1 under stagws. Then Publish to same workspace.
o Failed scenarios 1: Use Powershell REST API to move the report mypbireport2.pbix to same workspace stagws and with same AAD account (abcstag@test.com). It gives Bad Request error.
o Failed scenarios 2: Use Powershell command New-PowerBIReport (as per suggestion by MS team) to move the report mypbireport2.pbix to same workspace and with same AAD account. It gives Bad Request error.