Overview
As Langara begins to leverage more cloud applications and features (Exchange, Teams, etc.) owners of shared emails and Teams may find it challenging to recall how and where to manage access. Users can go to the following portal for managing access to group controlled applications and accounts, when the group is of the Microsoft 365 or Security types:
My Account - Organizations (microsoft.com)
Log in with your Langara account and password and you should see an overview of your account with access to various settings. For managing groups, you will want to click on the drop-down menu under My Account and select My Groups:

At present, you should see something along the following lines:

For groups of type Mail-enabled security, you can go to the following link instead:
https://admin.exchange.microsoft.com/?page=groups
TIP - It is recommended you check both links for the group you own as it is at Microsoft's discretion to change where each type can be accessed from.
In those pages you should see two options:
Groups I own will be a list of all groups that you can manage the membership of. This may include Distribution Lists, Teams and any other applicable M365 groups.
NOTE - This does not include SharePoint.
Groups I am in, as the name implies, is the list of all groups you are a member of. Some groups you will have the option to leave but others are assigned via systems such as Banner or Workday and the option will be greyed out.
NOTE - Do not leave a group unless you are absolutely sure you no longer need access.
You can also search for groups to join and put in a request but this is also not currently recommended as the names and purpose of the groups is not always clear.