Hi @Hanifa,
Thank you for posting in Microsoft Q&A Forum.
May I reconfirm if the Copilot you mentioned is the Copilot tab in Teams?

If so, may I know whether the Copilot tab appeared previously and then suddenly disappeared? I also noticed that you tagged your question under “Business.” Would you mind checking with your colleagues to see if they are experiencing the same behavior?
In the meantime, if Copilot has suddenly disappeared, please try the following troubleshooting steps:
1- If you're using Teams on the web, please try sign out and sign back in, clear your browser cache and try using an incognito/private tab to check if Copilot is visible.
2- For the Teams desktop app:
- Sign out and sign back in.
- Check for the latest update version.
- Try Repair/Reset via Settings > Installed apps > Microsoft Teams.

- Clear Teams cache by follow this article: Clear the Teams client cache
I'm looking forward to your response.
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