Outlook API - Getting Error BadRequest when using filter with OrderBy - outlook-api

Question

I am building a test application to fetch mail and attachments.
If I use the request, which includes a filter of IsRead=false and HasAttachments=true, it works
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=IsRead%20eq%20false%20AND%20HasAttachments%20eq%20true&$top=50
If I use the request, whereby I have added an OrderBy and removed the second filter HasAttachements, it works.
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=IsRead%20eq%20false&$orderby=Subject%20desc&$top=50
If I use the request to include both filters and orderBy
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=IsRead%20eq%20false%20AND%20HasAttachments%20eq%20true&$orderby=Subject%20desc&$top=50
it breaks with the following error
request.Result = {StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1
can anyone see what I am doing wrong from the requests I am making?
Thanks in advance
From testing different scenarios the problem does seem to be with the filter HasAttachments
just HasAttachments filter with orderBy breaks
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=HasAttachments%20eq%20true&$orderby=Subject%20desc&$top=50
just HasAttachments filter without orderBy works
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=HasAttachments%20eq%20true&$top=50 works
using 2 filters with orderBy (NOT HasAttachments) works
https://outlook.office365.com/api/v1.0/me/messages/?$select=Sender,Subject&$filter=IsRead%20eq%20false%20AND%20Subject%20eq%20%27Test%27&$orderby=Subject%20desc&$top=50

Answer 1

By running the request in the browser I get a much more detailed error
{"error":{"code":"InefficientFilter","message":"The restriction or sort order is too complex for this operation."}}
So it appears that using a combination of some filters and sorting together are not allowed.
The way I would have to solve my problem is to include HasAttachments in my select clause and then filter the results returned.