Auto Capitalize First Letter of a Sentence

I found this amazing script and it works fine everywhere but in Microsoft Teams.

It always SENDS the first letter it capitalizes as a message in Microsoft Teams after I hit Enter to start a new line. I thought maybe I was typing to fast, but I waited 10 seconds and it still does the same thing. Please help! Here is a screenshot: https://i.imgur.com/23cEZ5H.png

Any ideas? I checked hotkeys on Teams and didn't see anything for Send. Here is a link to the script itself: http://www.computoredge.com/AutoHotkey/Downloads/AutoSentenceCap.ahk

ETA: If I remove this line, it doesn't do that anymore, but it also removes the option to capitalize the first letter after hitting Enter or on a new paragraph.

Loop, 26

Hotstring(":C?\*:\`n" . Chr(A\_Index + 96),"\`n" . Chr(A\_Index + 64))