Hello,
We did recently discover an issue with the Edit in Excel functionality when working in a multi tenant environment in an OnPrem scenario. As per the requirements, Edit in Excel does require host name rewrite rule to be enabled in the web.config file of the relevant WebClient instance. Unfortunately, the tenant host name gets lost as we could see in a Fiddler trace. This is happening since the release of the Spring 2019 Update.
When Fiddler is not running:
When Fiddler is running you will see the following error:
We wanted to inform you that this is an issue not yet reported by any partner. We are working hard to mitigate it. If there is an update, we will post it here.
Thank you.

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