Explanation:

See the solution in the explanation below:
Explanation:
To add a disclaimer to all Teams meeting invites, you can use the Exchange admin center to create a mail flow rule that applies the disclaimer to meeting requests. Here are the steps to follow:
* Sign in to the Exchange admin center with your Microsoft 365 username and password1.
* In the left navigation, go to Mail flow > Rules.
* Click Add (+) and then select Create a new rule.
* In the New rule pane, enter a name for the rule, such as "Meeting disclaimer".
* Under Apply this rule if, select A message header includes any of these words.
* In the Specify header name box, enter X-MS-Exchange-Calendar-Meeting-Request. This is a special header that identifies meeting requests2.
* In the Specify words or phrases box, enter True. This means that the rule will apply to any message that has the header set to True.
* Click Add and then OK.
* Under Do the following, select Append the disclaimer.
* In the Specify disclaimer text box, enter the disclaimer text that you want to add to the meeting invites, such as:
Disclaimer: This meeting may be recorded for quality and training purposes.
* Click Enter text and then OK.
* Under Choose a mode for this rule, select Enforce.
* Click Save.
Now, when you or anyone in your organization schedules a Teams meeting, the disclaimer will be added to the meeting invites automatically.

Explanation:

Reference:
https://docs.microsoft.com/en-us/micros oftteams/teams-channels-overview

Explanation:

Reference:
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/groups-lifecycle
https://docs.microsoft.com/en-us/powershell/module/azuread/new-azureadmsgrouplifecyclepolicy?
view=azureadps-2.0