Hi Daniel Kaliel
Thanks for visiting our forum.
Microsoft Teams tag is mainly focused on the general issue of Microsoft Teams application troubleshooting.
According to your description, it is likely that dynamic membership is configured.
Microsoft 365 Groups can be configured as dynamic membership in Azure Active Directory, allowing group members to be automatically added or removed based on user attributes such as department, location, job title, and so on. To change dynamic to static, follow these steps:
- Sign into the Azure AD admin center with an account that is a global administrator, user administrator, or groups administrator in your Azure AD organization.
- Select Groups.
- From the All groups list, open the group that you want to change.
- Select Properties.
- On the Properties page for the group, select a Membership type of either Assigned (static), Dynamic User, or Dynamic Device, depending on your desired membership type. For dynamic membership, you can use the rule builder to select options for a simple rule or write a membership rule yourself.
For more details, you could refer to: Microsoft 365 Groups
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