Hey, I finally got to modify your script and can now give feedback. Firstly, here's the new code:

F6::runOrActivate("Messenger", "https://www.messenger.com/", "Profile 2")
F7::runOrActivate("Messenger", "https://www.messenger.com/", "Profile 4")

runOrActivate(title, url, profile) { path := "4.1.1.1.1.1.1" ; Tab group
SetTitleMatchMode 2
WinGet windows, List, - Google Chrome
loop % windows
{
    hWnd := WinExist("ahk_id" windows%A_Index%)
    winAcc := Acc_ObjectFromWindow(hWnd, 0)
    winTitle := Acc_Get("Name", 4,, winAcc)
    winProfile := StrSplit(winTitle, " - ").Pop()
    if (winProfile != profile)
        continue
    loop % Acc_Get("ChildCount", path,, winAcc)
    {
        if A_Index > 9
            continue
        tabTitle := Acc_Get("Name", path "." A_Index,, winAcc)
        if InStr(tabTitle, title)
        {
            WinActivate
            WinWaitActive
            Send % "^" A_Index
            return
        }
    }
}
Run % "chrome.exe --profile-directory=""" profile """ " url
}
I got Acc.ahk properly integrated to my system and my installation of AHK so it ran successfully, but not as expected. It still opens new tabs of the same websites that I added at the top of this code block, in the arguments given to runOrActivate(). The window title of the website's window I'm trying to target here is Messenger - Google Chrome which I got with this method:

^q::
WinGetTitle, title, A MsgBox, %title% return
Thus, it doesn't really function differently from my original code. (This one.)

!Numpad1::
Run, chrome.exe --profile-directory="Profile 2" https://www.messenger.com return


P.S.: I just made two new posts in r/AskProgramming and in this subreddit about this but with a new inquiry about Visual Basic. I'll mention you there too if you don't mind.