Running Python Script through Crontab doesn't work

So I have written a script to summarize a few newsletters and send them to me in Telegram. The script itself works perfectly. Now I tried to run this script every morning at 7 via crontab on a Ubunutu Server. The Log File looks fine, every print() I used in the script shows up normally without errors, but the it doesn't send the message.

My Crontab command:

00 12 * * * DISPLAY=:0 /usr/bin/python3 /root/data/App/Briefing/main.py >> /home/main.log &2>1

Python scripts:

main.py

import ai as AiHandlerimport mail as MailHandlerimport send as Telegramimport pandas as pdfrom datetime import datedef start():    files = MailHandler.scanEmails()    files = AiHandler.summarize(files)    print(files)    data = pd.read_csv('checkpoint.csv', sep=';')    checkpoint = createMsg(data)    s = f"morgentliches Briefing vom {date.today().strftime("%d.%m.%Y")}".replace(".", "\\.")    s += "\n\n\n ☕️ *Die* *Lage* *am* *Morgen* *\\-* *Spiegel*\n\n\n" + createMsg(pd.read_csv('spiegel.csv', sep=';'))    s += "\n\n\n 🐻 *Berlin* *\\-* *Tagesspiegel* *Checkpoint*\n\n\n" + checkpoint    s += "\n\n\n🔌 *Tech* *Update* *\\-* *ManagerMagazin* \n\n\n" + createMsg(pd.read_csv('manager.csv', sep=';'))      Telegram.sendMessage(s)def createMsg(data):    s = ""    for i in range(5):        thema = data['Thema'][i].replace('*', '\\*')        zsm = data['Zusammenfassung'][i].replace('*', '\\*')        s += "👉\t" +"*" + thema +"*" +"\n"        s += zsm +"\n"    s = s.replace("-", "\\-")    s = s.replace(".", "\\.")    s = s.replace("(", "\\(")    s = s.replace(")", "\\)")    #s = s.replace("*", "\\*")    s = s.replace("!", "\\!")    return sstart()

send.py

import telebotdef sendMessage(msg):    bot = telebot.TeleBot("XXXXXX")    bot.send_message(chat_id="@morgenbriefing", text=msg, parse_mode="MarkdownV2")

I tried adding DISPLAY:=0 to the crontab command but it didnt help