Some accent shortcut keys not working in Word (but one does!)

Hi, I got an older laptop at work (not crazy old, but used by others) and in Word (Microsoft 365 Apps for Business) two of the three shortcut keys I regularly use to type accented characters don't work.

- I can do Ctrl-` followed by a letter and get an accent grave (So Ctrl-`, e gives me è)

- But, Ctrl-' does *not* give me an accent aigu. Ctrl-', e just gives me an e, rather than é.

- Similarly, I get no accent circonflexe when I use Ctrl-Shift-^. Ctrl-Shift-^, e just gives me an e, rather than ê.

I have using the English US keyboard layout (and have disabled the French (Canadian) keyboard.)

I've checked that there are no other actions mapped to the Ctrl-' and Ctrl-Shift-^ key combinations (in Customize Ribbon, Keyboard Shortcuts, Customize).

I've googled up and down and found no one with the same problem. 

Again, the one works - I can make à, è and ò, but not á, é ,ó, â, ê, or ô. I'm forced to use "Insert Symbol" every time I want to add an accented character (and I'm in Canada, so have to write lots of words with accented characters in them.)

Anyone have any ideas?

Thanks in advance.