Hi @Daniel Sherwood ,
In the point of Outlook, I couldn't find the option that could disable the option.However, based on my research, I found we could disable the "share to teams" option via exchange powershell like below:
Disable-App -Identity 545d8236-721a-468f-85d8-254eca7cb0da -Mailbox Jade
For more information, please refer to these docments :
- the Enabling or disabling Share to Teams part of Share to Teams from Outlook
- the Example 3 part of Disable-App
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