InfoPath Dev

Hello everyone,

 I have spent countless hours but can't figure out.  Hopefully someone can point me in the right direction.

 I have a REST web service (https://integrationserver-acbj.msappproxy.net/WebService/WcfDataService1.svc/Invoices) and it works fine when viewing from browser, however, when I added this web service as a data connection, InfoPath doesn't work, gives me error ID 5566 and IIS logs says "GET /WebService/WcfDataService1.svc/Invoices - 443 - ::1 InfoPathDA - 405"

 InfoPath designer can pull the data fine but it doesn't work after published to a SharePoint online site.

 Thanks in advance for your help! 

Try changing your data connection to a UDCX and see if that does the trick.

 Hi Hillary,

 Thanks for your quick response.  I forgot to mention that the connection is already converted and in my Data Connection library on SharePoint.

  

Well, there was my only idea. :) We can't check the ULS logs, since it is SharePoint Online, unfortunately. I don't suppose you have an on prem server you can test with?

 Unfortunately, I don't have an on-prem SP server to test with.