Why is a831bb9f-aef5-4b63-91cd-4027b16710cf?

You need to have 'ReadPackages'. According to this error message, the error you received caused by the user (a831bb9f-aef5-4b63-91cd-4027b16710cf) does not have the access permission to your feed. And also, as I checked from backend, a831bb9f-aef5-4b63-91cd-4027b16710cf is the VSID of your Build Service account.

What is the path /status-0123456789abcdef?

The path /status-0123456789abcdef is a default health endpoint hosted on all instances of API Management. Set api.contoso.net as a custom probe host name to secure it with the TLS/SSL certificate. The host name contosoapi.azure-api.net is the default proxy host name configured when a service named contosoapi is created in public Azure.

What is b547afa5-0648-5fda-8cfe-eb7c034b92ca?

b547afa5-0648-5fda-8cfe-eb7c034b92ca Plan, direct, or coordinate the management or operation of farms, ranches, greenhouses, aquacultural operations, nurseries, timber tracts, or other agricultural establishments.

What is bbf83ab0-46e1-4092-8973?

{BBF83AB0-46E1-4092-8973-825414452896} Silica sand (flour) silica sand grinding grain size in the micrometer range {F8AA72B9-6F37-4092-B557-73B96A8C72E4} Cottonseed linters second cut (economic allocation) cottonseed dehulling