Hello Iniobong,
If you are referring to SharePoint (which is the backend of Teams) then please refer to the following documentation:
Set up and manage access requests
"The access request feature allows people to request access to content that they do not currently have permission to see. As a site owner, you can configure the feature to send you mail when someone requests access to a site. You can then choose whether to approve or decline their request. If you approve the request, you can also specify the specific level of permission you’d like to assign to a user."
If this is helpful please accept answer.