This works, too. It’s actually common that your dmarc-entry needs some time to be accepted everywhere. Wait a few days more and your mails don’t hit the spam folder on google and outlook.

Just did that a few months ago. No issues yet.

I’ve run into one issue in my time on a weird self hosted platform. The DMV said “oh. Let me call IT and get that unblocked” and then they did and it was done. All other times have been fine