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Designed to validate potential usernames by querying OneDrive and/or Microsoft Teams, which are passive methods.
Additionally, it can output/create a list of legacy Skype users identified through Microsoft Teams enumeration.
Finally, it also creates a nice clean list for future usage, all conducted from a single tool.
FreshRSS 
$ python3 .\KnockKnock.py -h
_ __ _ _ __ _
| |/ /_ __ ___ ___| | _| |/ /_ __ ___ ___| | __
| ' /| '_ \ / _ \ / __| |/ / ' /| '_ \ / _ \ / __| |/ /
| . \| | | | (_) | (__| <| . \| | | | (_) | (__| <
|_|\_\_| |_|\___/ \___|_|\_\_|\_\_| |_|\___/ \___|_|\_\
v0.9 Author: @waffl3ss
usage: KnockKnock.py [-h] [-teams] [-onedrive] [-l] -i INPUTLIST [-o OUTPUTFILE] -d TARGETDOMAIN [-t TEAMSTOKEN] [-threads MAXTHREADS] [-v]
options:
-h, --help show this help message and exit
-teams Run the Teams User Enumeration Module
-onedrive Run the One Drive Enumeration Module
-l Write legacy skype users to a seperate file
-i INPUTLIST Input file with newline-seperated users to check
-o OUTPUTFILE Write output to file
-d TARGETDOMAIN Domain to target
-t TEAMSTOKEN Teams Token (file containing token or a string)
-threads MAXTHREADS Number of threads to use in the Teams User Enumeration (default = 10)
-v Show verbose errors
./KnockKnock.py -teams -i UsersList.txt -d Example.com -o OutFile.txt -t BearerToken.txt
./KnockKnock.py -onedrive -i UsersList.txt -d Example.com -o OutFile.txt
./KnockKnock.py -onedrive -teams -i UsersList.txt -d Example.com -t BearerToken.txt -l
To get your bearer token, you will need a Cookie Manager plugin on your browser and login to your own Microsoft Teams through the browser.
Next, view the cookies related to the current webpage (teams.microsoft.com).
The cookie you are looking for is for the domain .teams.microsoft.com and is titled "authtoken".
You can copy the whole token as the script will split out the required part for you.
@nyxgeek - onedrive_user_enum
@immunIT - TeamsUserEnum
