Thanks in advance,
Thank you for writing to us!
We have tested fetching data from Analysis Services when integrating with Angular. Our team was not able to reproduce the issue. Could you please provide your sample project? It would greatly help us.
Also, we suggest connecting to our cube to see if the data from here is displayed correctly. Sample report for connection:
"dataSourceType": "microsoft analysis services",
"catalog": "Adventure Works DW Standard Edition",
"cube": "Adventure Works",