Perhaps it has to do that I have not setup a secure connection to my Xibo CMS.
I read at the F.A.Q. (down below) that it is not possible to publish designs over http.
We’ve found a few issues, one with SAML enabled CMS instances and the other a general v4 issue:
If you are not effected by the SAML issue, the general v4 issue should be solved, but you may need to enable the correct scopes in the “Sharing” options of the Canva Application.
We have found another issue with the scopes edit form, but it is just visual. If you go in there and grant full access and save, then the integration should work.
If you try again and it still doesn’t work, you could go to your Applications in the CMS, find the one for Canva, edit it and enable “Full access” in the sharing section:
I have that in the log output – the slides show up in media as JPEGs (as selected in the export) – it appears the something to do with tagging as well as layout creation is crashing it out