On a W-2, a control number in Box D is not required by the IRS. It's for your employer/payroll department's purpose, or sometimes used when importing a W-2 from the employer/payroll department. You can try leaving the Box D control number blank and trying to efile.
If it won't let you efile it with a blank in Box D, see this FAQ:
FAQ: Box D Control Number on W-2
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/box-control-num...
