Note: The method below is only available on Feishu V3.37 or above.
You can join a team by scanning its Team QR code. Please ask your Team Admin for it.
If your Team Admin doesn't know where to get the code, just follow these steps:
Click your profile photo and go to Suite Admin - Add Members - Invite via QR Code to copy and share the code.
Also, you can click Contacts - Organization - Add Team Member - Invite via QR Code to get the code.
Click your profile photo - Administration - Invite Member to find the Team QR Code.
Also, you can click the Contacts icon on the left bar, and go to Organization - Add Team Member - Quick Invitation to get the Team QR Code.