The following shows that you may have a misunderstanding of how the IAB TCF framework works:
Where to go to delete the old TC string and re-obtain consent?
The TC String is a standardised format maintained under the IAB's Transparency and Consent Framework that captures a user's fine grained consent choices, which in the case of AdSense with the Funding Choices GDPR consent capture integration is stored within a domain-restricted cookie (which has the name "FCCDCF").
So it's not simply a case of regenerating some property of your AdSense configuration, but rather you need to delete any such cookie containing a TC String containing consent that was captured more than 13 months ago before it is presented when loading your ads.
Neither is it a case of regenerating affected ad units because the same violation will then be accumulated on the new units.
This answer gives one approach to processing the TC String contained within the FCCDCF cookie and, if necessary, deleting it.