A shortcut has commandeered Outlook

A while back in my keyboard shortcuts I set one to snap my screen to the middle third, using the command SHIFT + COMMAND + M. (M for middle). Unbeknownst to me, that's also the same command Microsoft Outlook uses to move an email to a folder.

I went back into the BetterSnapTools and changed the shortcut to SHIFT + COMMAND + C (C for centre) which works fine.

Yet, when I use Microsoft Outlook the old SHIFT + COMMAND + M still snaps the screen and does not allow me to move an email.

When I quit Better Snap Tools the SHIFT + COMMAND + M works as it should in MS Outlook.

Any ideas? Thanks so much.

Screenshot 2022-07-12 at 12.41.08 pm