Username sync in SuccessFactors out of the Box connector for futurehires

Identity Security Cloud (ISC) ISC Discussion and Questions
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Your issue looks like it may be related to

Onboarding 2.0 integration with the SuccessFactors connector. Username issues from SAP - Identity Security Cloud (ISC) / ISC Discussion and Questions - SailPoint Developer Community

I am looking into rehires and Onboarding 2.0, trying to work out the best way forward.

I found this too - which looks promising

Handling ONB2.0 rehires in SailPoint - SAP Community