Hi @SHUO .H ,
For create a Microsoft Team(create Team Channels) from SharePoint, you need to pay attention to the following points:
- Only Team sites that are connected to a Microsoft 365 group can be connected to Microsoft Teams(create Team Channels).
- You must be the Site owner of the Team site to add Microsoft Teams
- You must be the Site owner of the Team site to add SharePoint resources as tabs in Team channels
- And you only create Private Channels a Microsoft Teams Team
Please follow the steps:
1.Go to the Teams Site as a site admin
2.Click Add Microsoft Teams >> Continue >> choose the resource you want >> Add Teams
3.Then open the Teams App, find you Team site
4.Click Add channel
5.On the Create a channel windows, select "Private - Specific teammates have access"
6.Go to the SharePoint admin center, you can see the channel site for the specific Team site
5.Here is my test:
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