It's been quite some time now, just fix the graph hook please! We need to manage individual signatures and variants in New Outlook.
User email signature management via Graph API

Now that the Outlook email signature roaming is rolled-out, can we expect that APIs for managing email signatures (e.g. create a new signature, set it as default, get a list of signatures)?
Before we were able to use EWS endpoints to get and set user's email signatures.
Microsoft Security | Microsoft Graph
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Srinivasa Rao Darna 6,761 Reputation points Microsoft External Staff
2022-11-17T16:00:43.54+00:00 Hi @Niko Vrdoljak ,
Currently with Microsoft Graph API, doesn't have support for Signature.
Refer to documentation mailboxsettings, which lists mailbox settings that can be managed through Graph.There is Graph Feed Request submitted, you can upvote the request and provide you feedback, and Microsoft Product Engineering team can review and check the feasibility and consider for implementation.
Make email signatures available on Graph
Hope this helps.
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