We use 365 for email and the domain DNS is controlled by Shopify.
To enable better mail flow from 365 we have to setup all the relevant SPF/DKIM and dmarc policies. This is something i've done many times on our other domains that are held of Fasthosts and Godaddy. SPF and Dmarc are fine, however when i try to add the 2 Cname records i get the following error message.
"unable to add dns record. value must be a valid FQDN"
I know that the syntax is correct, but i can't seem to get anyone at Shopify to even understand the concept of DKIM so reaching out to anyone on here.
I have a couple clients with same issues. I still cannot get Shopify to correct or respond. Last attempt: I did Chat with "William" and he was to email me a response.
The problem is the "_" underscore character. There mechanism to update Google DNS is poor and will not accept the underscore character "_".
It's a simple fix SHOPIFY. and it IS standard to allow the character in CNAME records. Even if you cant correct your scripts to add the records, you can manually do it. I have 2 clients that need this corrected ASAP, before they drop Shopify and I move to steer others away.
Please message or email me directly if you have questions.