Since Microsoft released “Roaming Signatures” it has been expected that there will come support for this in the Graph API, so that external applications, for instance IAM systems, can update signatur...
Hear, hear! Give us Graph API ability to set the HTML of our users' Roaming Signatures! It is crazy how long this hasn't been an option! Once you do release the API functionality, You better give us AMPLE time to adjust our signature deployment scripts before sunsetting old Outlook