Thanks for asking! If you have configured "basic auth" for your inbox, you must make sure that whichever application you're using to send data to OpenFn makes use of basic auth in their HTTP post request. Basic Auth in curl, for example, looks like this:
curl -u myusername:mypassword https://www.openfn.org/inbox/your-inbox-uuidHere is what a basic auth header looks like when transmitted using HTTP:
Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1lAnd just to make sure we're on the same page, I have pasted the Inbox Auth setup screen below. Is this where you configured your authentication option?