Similar Issue - OCM works with the preview for the e-mail item, but when I try to open the add-in at the bottom "Add-ins", I get the following message and it doesn't open with the "Overview Deck" for importing text and changing fields, etc. This was installed on a prior mailbox and now is installed in a different mailbox. It seems to be working correctly on the only mailbox I want it to work on for the preview items, but doesn't open up the deck tool.
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