I'm trying to do a simple flow, and am getting the error listed in the subject line.

So I went and checked the DLP, (since I'm the company's global admin), and found that the one connector listed is in the DLP:

So it doesn't appear to be a DLP issue. So I've been going through the License section trying to find anything in there that would be an issue. I'm currently listed as having an E3, and I have the Free Flow license. I'm not sure what other license issues could affect this.
Any suggestions?