twobeatsahead

I had this same problem and finally resolved it. The instructions for this are incomplete. Follow them until you get to bullet number 7, the last action in the list. It says, "Delete the other SPF records (the ones that don't include squarespace), then save again." This is actually complicated and a little bit scary for a Google Workspace. You will actually have to delete the entire synthetic record because that is the only option. I spoke to Google about this and they advised the following: First, copy the Google Workspace synthetic record in its entirety. (I copy and pasted into a spreadsheet.) Next, delete the Google Workspace synthetic record. This is the scary part. Now, in "Custom resource records" you will add back only two items from the synthetic record that you copied and deleted. The first one is the MX record. You'll notice that you need to add each mail server of this record in its own form. Then add your second record, the " google._domainkey" also referred to as the DKIM record. Now go back to squarespace and verify your merged records.