OneMoreAddIn is disabled, and cannot be enabled

[eduardmanas]

Problem to Solve

OneMoreAddIn is disabled, and cannot be enabled

To Reproduce

Steps to reproduce the behavior:

1. Start OneNote
2. OneMore menu option not visible
3. From OneNote, File > Options> Add-ins. You can see OneMoreAddIn in the Disabled Application Add-ins section.
4. Attempt to enable it by selecting the add-in, pressing "Go...", then selecting the checkbox for "OneMoreAddIn", and pressing OK
5. Nothing happens, and if we return back to the Add-ins window, the add-in is still disabled.

Also, as per Troubleshooting.htm guide:

• Step 3) There is no %TMP%\OneMore.log file, so I believe the add-in doesn't even start up
• Step 5) As per steps above, the OneMoreAddIn does not enables itself
• Step 7) There is no dllhost.ext starting with "/Processid: {88AB."
• Step 8) I have uninstalled and reinstalled latest OneMore version several times with no success.

Expected Behavior

OneMoreAddIn should be enabled and the add-in menu should be visible in the command bar

Screenshots

No menu visible

Environment (if applicable)

• OneNote Version: Microsoft® OneNote® for Microsoft 365 MSO (Version 2504 Build 16.0.18730.20030) 64-bit
• OneMore Version: OneMore_6.7.1

Additional Context

OneMore has been working for years without issues. One day around Feb 2025 OneNote gave a warning saying it had disabled the plugin as it was unstable (around the time when I saw copilot in OneNote, but not too sure about this), and I haven't been able to re-enable it again. I assume this might be a OneNote upgrade issue that broke the add-in, but I am blind as to what the issue might be.

Any help would be most appreciated.

[petarmm]

FWIW I had this problem appear today, I solved it by uninstalling the latest OneNote update