DKIM not working

Site URL: https://www.theoldeden.com

I am using Bluehost to manage the email accounts associated to the domain (hosted in Squarespace).

There is an alert saying that there is a DKIM problem. I followed some guides and Bluehost's support and they helped me add a DKIM record to my domain. It isn't working though and I'm not sure what to change.

The current details are:

Host: 1591560155.theoldeden._domainkey.theoldeden.com
Record: TXT
Data: v=DKIM1;p=MIGfM... (the full key from a DKIM generator)

Can anyone point out what I've done wrong. I'm quite new to domain management so learning as a I go.

Thanks in advance.

Every find a solution to this?