cannot send E-mail with custom from

cannot send E-mail with custom from

Hi,
We are having some issues with our Zoho desk.
We entered a custom from address validated it.

After validation, we get another mail telling us to validate it in zoho mail (never seen before)

Nevermind, in Zoho Desk the mail is signed as "verified" but when sending a reply the error is " Error while processing the request! Email Address should be verified to enable sending from this ac"

Thanks

Alex