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Hi @Jaciter
Welcome to our forum!
Looks like your issue is more related to Outlook development, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client.
It seems like the error code 0x8004 might be related to issues with your add-in's compatibility or functionality in certain environments. Here are a few steps you can take to troubleshoot:
Check for Updates: Ensure that both the add-in and the Office application are updated to their latest versions. Compatibility issues often arise from outdated software.
Verify Permissions: If the add-in requires specific permissions, confirm that users have the necessary access rights.
Reinstall the Add-in: Sometimes, uninstalling and reinstalling the add-in can resolve unexpected glitches.
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