You are trying to do Brownfield import/sync to SDDC.
That is failing with similar message
In brownfield.log you see similar entries
[INFO] sddc_manager_helper:###: Generating SDDC Manager public API token
[ERROR] request_helper:###: Result status code from ESC[91mSDDC Manager token generation: 401
[CRITICAL] vcf_brownfield:###: ESC[##mFatal exception: ("Could not generate a token from SDDC Manager. Please review '/var/log/vmware/vcf/commonsvcs/vcf-commonsvcs.log' for further details.",)
VCF 5.x
Incorrect user entered when you initated import/sync
You need to use admin@local user/credentials for Brownfield import/sync to work.
In case that you are not sure what is admin@local password you can use steps from this article to reset it.
How to reset the Admin@local password in SDDC Manager