TXT DNS record wont accept underscore

I need to add a TXT record that looks like this:
trx_ke.domainkey.MYDOMAIN.COM

OVH wont accept underscors (
) as a value. How can I do it?

Hello @SzymonB1,

If it is an external DKIM field, you can add it from the field provided.
https://docs.ovh.com/ie/en/dedicated/optimise-email-sending/#configure-the-dkim-record

^FabL