Alt+Shift+R Not Working

[mccn]

Alt+Shift+R (the default for Reply Temporarily (Back)) is not working for me.

• Double-checked that it was the actual command for it.
• Tried to remap it to other key combos, it worked.
• Deleted the old key setting and tried to remap it to Alt+Shift+R and it won't stick. It only registers "Alt+Shift" but when i press R, it doesn't register.
• All my keys are working fine outside of this issue.
• Set all the keybinds back to default, still doesn't work.
• Restarted the game, still doesn't work.
• Restarted the PC, still doesn't work.
• Sent a bug report, but wanted to put it here too just in case anyone can help or if anyone has the same issue.

EDIT: There's also no error message of the key combo being a duplicate of something else, it just doesn't stick.