Reason #1 Subsidiary Status Problem
Check the subsidiary existence and make sure Inactive is unchecked
Reason #2 Company Name
Verify the subsidiary name is exactly the same as its subsidiary record, which can be found in Setup > Company > Subsidiaries. A child-parent relationship must be mapped as below
top level : lower level : child which means subsidiary names are concatenated in the sequence from high level to low, separated by <space><colon><space>
Using internal ids instead of company names may save you the hassle. Select Choose Reference Type = Internal ID when doing the field mapping.
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