DKIM fails validation

I have worked with 3 groups of web designers and my hosting company to have this issue resolved for over 3 weeks. The validations works on their desktops except mine. What’s the fix?

The DKIM record has not been verified.
Retry Validation
Delete DKIM Configuration


Hey Bill, just messaged you.

Just replied from my business account.
Let me know if the info helps. You should have the Miva support # and
contact email. Please reply to my business account/