Fin & Ops step named "Execute Action" returns error Bad Gateway on "name of action" dropdown

Question

Logic App's step was working last Friday (2024-02-23) and at about 11:44 am PST it stopped working today (2024-02-26). The step was using the Fin & Ops (Dynamics 365) API connection using a service principal and secret. None of the service principal's secrets have expired. Microsoft 365 and Azure health pages do not show any relevant outages or issues. The step is called "Execute an Action". The instance drop down pre-populates with all instances. I selecting our development (sandbox) instance. The next dropdown is named "Action" or "Name of action" when it tries to populate the dropdown box returns the following error:

Could not retrieve values, BadGateway More diagnostic information: x-ms-client-request-id is 'AFA7A71F-C3E0- 4F80-9F3D-2F3D1CF871FB'.

Answer 1

We suspect it was a change made where we defined an optional parameter in the AX method that implements the oData action; thus, when calling it through oData we got a message mentioning "Ambiguous match found." https://daxonline.org/1582-odata-actions.html