Hi @vits18735a0 

It works for problem as well, Check OOB Data Lookup rules defined or not, you need to define Data lookup rule as well.
Alternatively, you can try "Assignment rule" if you only want to set "Assignment group" and "assigned to".

Below given reference link might be helpful:
Why Assignment Datalookup rules bringing wrong data though there is a matching category/sub-category...

If my response solves your query, please marked helpful by selecting Accept as Solution and Helpful. 
Thanks,
Prerna