I tried the REST service https://support.kobotoolbox.org/en/articles/592398-rest-services to beeceptor. During submission, I get the error “CSRF token missing”. This has been reported several times during the last year in the community, but all but one old thread never had an answer.

I recreated the REST service today, and it works nicely. Looks like it is an intermittent problem, as one of the previous post on the subject mentioned.