We are planning to discontinue support for 3DES in O365 Skype for Business starting on July 10, 2019. Please refer to the following O365 Encryption guidance for 3DES retirement preparation - https://docs.microsoft.com/en-us/office365/securitycompliance/technical-reference-details-about-encr...
HOW TO PREPARE
The following Office 365 Skype for Business clients and devices rely on 3DES and therefore must be updated or replaced:
To prepare your organization for the client connectivity scenarios, you should ensure that your clients meet the following minimum versions:
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