Hi @Sami Mozala ,
Please check if your network are running into issues and are you using some kind of VPN? If so, please restart the VPN and test.
Is this only happened on your account only and only when chatting with your partner?
I think you may first check the network and restart the Teams client. If that doesn't work, please also try re-installing the Teams and remove the legacy files of it.
Best regards,
Lou
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