Here is an IRS statement showing what to do if missed RMD. Link: https://www.irs.gov/retirement-plans/retirement-plan-and-ira-required-minimum-distributions-faqs

Q9. Can the penalty for not taking the full RMD be waived?

Yes, the penalty may be waived if the account owner establishes that the shortfall in distributions was due to reasonable error and that reasonable steps are being taken to remedy the shortfall. In order to qualify for this relief, you must file Form 5329 and attach a letter of explanation. See the Instructions to Form 5329 PDF.