Hello @岩井 俊樹,
Thank you for reaching out to the Q&A forum!
As Q&A Assist mentioned above, I would like to provide a clearer explanation:
When you rename a Team in Microsoft Teams, the SharePoint site URL does not change.
This is because the SharePoint site address is created based on the original Team name, and once the site URL is generated, SharePoint does not automatically update it, even if you later rename the Team.
Additionally, I found this article that explains the same behavior in more detail: Renaming Teams and Channels Can Be Messy, Especially with SharePoint - Petri IT Knowledgebase
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
This article confirms that renaming a Team does not update the SharePoint URLs, since SharePoint does not sync the site address automatically with the new Team name.
If you have any questions or insights, please feel free to reply here.
Looking forward to hearing from you!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.