TXT record for _dmarc will not save in Netlify DNS panel

Domain: toscanareputationstudio.com (registered through Netlify, using Netlify DNS)
Project name: [INSERISCI QUI IL PROJECT NAME]

I am adding email authentication records for Brevo. Three of the four records saved without any problem and are visible in the DNS records list:

The fourth one will not save. I select TXT, enter _dmarc as the name, paste the value, click Save, and the record never appears in the list. No error message is shown, the form just closes.

Values I have tried:

v=DMARC1; p=none; rua=mailto:rua@dmarc.brevo.com
v=DMARC1;p=none;rua=mailto:rua@dmarc.brevo.com
v=DMARC1;p=none;rua=mailto:rua@dmarc.brevo.com

I have also checked with an external DMARC lookup tool and the record is not published, so this is not a display issue in the dashboard.

Could you add this record from your side, or tell me what the panel is rejecting? Thank you.