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In Visual Studio for Mac (version details attached), when a developer adds an Addin Reference to an addin/extension project, it fails with the message Save Failed.Upon closing and reopening the addin project, the added reference is not included.
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Mac Visual Studio Code
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Visual Studio For Mac Wikipedia
If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
Visual Studio For Mac
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices.