teams chat error to reply

What exactly is this error message saying? You can also post a screenshot of this error message.

Hi Lara, Welcome in Community

Try to sign out and restart Teams: click your profile picture or initials in the top-right corner of Teams and select Sign out.

1. Right-click the Teams icon in your system tray (near the clock) and select Quit.
2. Reopen Teams, sign back in, and test your reply.

If not solved, clear the Team's cache, see here

https://learn.microsoft.com/en-us/troubleshoot/microsoftteams/teams-administration/clear-teams-cache

Let me know how it goes

Elvis