This sounds like a prime-use case for Data Sources! Data Sources allow you to upload summary-level data from other systems. They are free to use (don't count as server calls), don't increment Visits or Unique Visitors, and are easy to implement. You can use the search for some Adobe provided documen...

The best approach in Workspace is to use the Quick Insights panel. Than panel lets you choose the dimension and metric for the report and also lets you change them super quickly 

This error is not coming from the Adobe Analytics API itself but rather from Python while handling the request. If you are struggling to replicate the error on your local environment, you may want to check whether the versions of Python and its modules (like requests) are the same in both environmen...