Incorrect delta result from GetAsDeltaGetResponse on mail folder #969
Description
Describe the bug
I am using Delta handling against a mail folder and have found that consistently if older messages are added to the folder the delta query will return them twice in the result
Expected behavior
Expectation is that the delta call would only return a message once
How to reproduce
Reproduction-
(dates of the emails added to highlight the problem, not specifically needed to reproduce)
Folder with 1 email (14/01/2026)
Client.Me().MailFolders().ByMailFolderId(folderId).Messages().Delta().GetAsDeltaGetResponse() against the folder
- returns 1 email plus the delta link for use later
move 2 more recent (20/01/2026 ) emails into the folder
Client.Me().MailFolders().ByMailFolderId(folderId).Messages().Delta().WithUrl(deltaLink).GetAsDeltaGetResponse()
- returns 2 emails and new delta link
move 2 older emails (09/01/2026, 22/12/2025) into the folder
Client.Me().MailFolders().ByMailFolderId(folderId).Messages().Delta().WithUrl(newdeltaLink).GetAsDeltaGetResponse()
- returns 4 emails (2x each of the emails it should be returning) and new delta link
SDK Version
v1.93.0
Latest version known to work for scenario above?
N/A
Known Workarounds
N/A
Debug output
No response
Configuration
No response
Other information
No response