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Problems with cname record on simply.com

I’m trying to add a CNAME DNS record inside the control panel on simply.com so I can connect my clients webflow website to his custom domain. But it keeps giving me an error saying that " * An error occurred while trying to create the record, please check the values entered." The value I typed in is “proxy-ssl.webflow.com”.

Anyone who knows why it is problem with simply.com, i have never experienced that with other providers.