Under the circumstances, only an employer profit-sharing contribution is permitted, not an elective deferral or Roth contribution.
Only sole proprietors can make the deferral election after the end of the year and only for the first year of the solo 401(k) plan, but only for plan years beginning after 2022. Shareholders in an S-corp are employees of the S-corp, not sole proprietors, so the elective deferrals are excess contributions. Also, your plan was established for 2022, so even if you were a sole proprietor you couldn't do this.
Elective deferrals made in excess of the permissible amount are subject to a 10% penalty on Form 5330 unless a return of the excess contribution is made by April 18, 2023. TurboTax does not support the preparation of Form 5330.
